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{{Infobox medical condition (new)
{{chú thích trong bài}}
| name = Creutzfeldt–Jakob disease
| synonyms = Classic Creutzfeldt–Jakob disease<ref name=CDC2015Main/>
| image = Practneurol-2016-001571f02.jpg
| caption = [[Magnetic resonance imaging|Magnetic resonance image]] of sporadic CJD<ref name="CJD mimics and chameleons"/>
| field = [[Neurology]]
| pronounce = {{IPAc-en|UK|ˌ|k|r|ɔɪ|t|s|f|ɛ|l|t|_|ˈ|j|æ|k|ɒ|b}} {{respell|KROYTS|felt|_|YAK|ob}}, {{IPAc-en|US|-|_|ˈ|j|ɑː|k|oʊ|b}} {{nowrap|{{respell|-|_|YAH|kohb}}}}<ref>{{citation|last=Wells|first=John C.|year=2008|title=Longman Pronunciation Dictionary|edition=3rd|publisher=Longman|isbn=9781405881180}}</ref>
| symptoms = {{ubl|'''Early''': memory problems, behavioral changes, poor coordination, visual disturbances<ref name=NIH2003/>|'''Later''': [[dementia]], involuntary movements, blindness, weakness, [[coma]]<ref name=NIH2003/>}}
| complications = [[Aspiration pneumonia]] due to difficulty coughing
| onset = Around 60<ref name=NIH2003/>
| duration = 70% die within a year of diagnosis<ref name=NIH2003/>
| types = Sporadic ([[mutation]]), Familial ([[heredity]]), [[Iatrogenic]] (acquired), [[Variant Creutzfeldt-Jakob disease|Variant]] ([[Infection]])<ref name=NIH2003/>
| causes = [[Prion]]<ref name=NIH2003/>
| risks = Having at least one living or deceased ancestor with the disease (in case of hereditary CJD)
| diagnosis = Based on symptoms and medical tests after other possible causes are ruled out<ref name=NIH2003/>
| differential = [[Encephalitis]], [[chronic meningitis]], [[Huntington's disease]], [[Alzheimer's disease]]<ref name=NIH2003/>
| prevention =
| treatment = [[Supportive care]]<ref name=NIH2003/>
| medication = '''For pain relief: '''[[Morphine]], [[Methadone]]
| prognosis = Universally fatal<ref name=NIH2003/>
| frequency = 1 per million per year<ref name=NIH2003/>
| deaths =
| alt =
}}
<!-- Definition and symptoms -->
'''Creutzfeldt–Jakob disease''' ('''CJD'''), also known as '''subacute spongiform encephalopathy''' or '''neurocognitive disorder due to prion disease''', is a fatal [[neurodegeneration|degenerative]] [[brain disorder]].<ref name=NIH2003/><ref name=CDC2015Main>{{cite web |title=Creutzfeldt-Jakob Disease, Classic (CJD) |url=https://www.cdc.gov/prions/cjd/index.html |website=CDC |access-date=21 November 2018 |date=2 October 2018}}</ref> Early symptoms include memory problems, behavioral changes, poor coordination, and visual disturbances.<ref name=NIH2003/> Later symptoms include [[dementia]], involuntary movements, blindness, weakness, and [[coma]].<ref name=NIH2003/> About 70% of people die within a year of diagnosis.<ref name=NIH2003/> The name Creutzfeldt–Jakob disease was introduced by [[Walther Spielmeyer]] in 1922, after the German neurologists [[Hans Gerhard Creutzfeldt]] and [[Alfons Maria Jakob]].<ref>[http://www.whonamedit.com/synd.cfm/696.html Creutzfeldt–Jakob disease] @ [[Who Named It]]</ref>


<!-- Cause and diagnosis -->
[[Tập tin:Practneurol-2016-001571f02.jpg|thumb|[[MRI]] (Chụp cộng hưởng từ) của CJD (Bệnh Creutzfeldt-Jakob) lẻ tẻ<ref name="CJD mimics and chameleons"/>]]
CJD is caused by a type of abnormal protein known as a [[prion]].<ref name=CDC2019>{{cite web |title=Creutzfeldt-Jakob Disease, Classic (CJD) {{!}} Prion Diseases {{!}} CDC |url=https://www.cdc.gov/prions/cjd/index.html |website=www.cdc.gov |access-date=17 June 2019 |language=en-us |date=1 February 2019|quote=Classic CJD is a human prion disease}}</ref> Infectious prions are [[protein folding|misfolded]] proteins that can cause normally folded proteins to also become misfolded.<ref name=NIH2003/> About 85% of cases of CJD occur for unknown reasons, while about 7.5% of cases are [[heredity|inherited from a person's parents]] in an [[autosomal dominant]] manner.<ref name=NIH2003/><ref name=Man2015>{{Cite journal|last1=Manix|first1=Marc|last2=Kalakoti|first2=Piyush|last3=Henry|first3=Miriam|last4=Thakur|first4=Jai|last5=Menger|first5=Richard|last6=Guthikonda|first6=Bharat|last7=Nanda|first7=Anil|date=2015-11-01|title=Creutzfeldt-Jakob disease: updated diagnostic criteria, treatment algorithm, and the utility of brain biopsy|journal=Neurosurgical Focus|language=en-US|volume=39|issue=5|pages=E2|doi=10.3171/2015.8.FOCUS15328|pmid=26646926|issn=1092-0684|doi-access=free}}</ref> Exposure to brain or spinal tissue from an infected person may also result in spread.<ref name=NIH2003/> There is no evidence that sporadic CJD can spread among people via normal contact or [[blood transfusions]],<ref name=NIH2003/><!-- quote = Recent studies suggest that while there may be prions in the blood of individuals with vCJD, this is not the case in individuals with sporadic CJD. --> although this is possible in [[variant Creutzfeldt–Jakob disease]].<ref>{{cite journal | vauthors = Brandel J, Vlaciu M, Culeux A, Belondrade M, Grznarova K, Plu I, Levasseur M, Haik S | title = Variant Creutzfeldt–Jakob Disease Diagnosed 7.5 Years after Occupational Exposure | journal = New England Journal of Medicine | volume = 383 | date = July 2, 2020 | issue = 1 | pages = 83–85 | doi = 10.1056/NEJMc2000687 | pmid = 32609989 | doi-access = free }}</ref><ref>{{cite web|title=Transfusion Handbook/ 5.4: Variant Creutzfeldt–Jakob disease (vCJD)|url=https://www.transfusionguidelines.org/transfusion-handbook/5-adverse-effects-of-transfusion/5-4-variant-creutzfeldt-jakob-disease-vcjd|website=Joint United Kingdom (UK) Blood Transfusion and Tissue Transplantation Services Professional Advisory Committee|access-date=29 July 2021|date=4 February 2014|url-status=live}}</ref> Diagnosis involves ruling out other potential causes.<ref name=NIH2003/> An [[electroencephalogram]], [[Lumbar puncture|spinal tap]], or [[magnetic resonance imaging]] may support the diagnosis.<ref name=NIH2003/>
'''Bệnh Creutzfeldt-Jakob''' (Bệnh bò điên; CJD: Nhũn não) là một rối loạn não hiếm gặp,<ref name="CDC1">{{chú thích web |title = CJD (Creutzfeldt–Jakob Disease, Classic) |url = http://www.cdc.gov/ncidod/dvrd/cjd/index.htm |publisher = Centers for Disease Control and Prevention |date = ngày 26 tháng 2 năm 2008 |access-date = ngày 20 tháng 6 năm 2009}}</ref> gây tử vong do [[prion]].


<!-- Treatment, epidemiology, and history -->
==Tham khảo==
There is no specific treatment for CJD.<ref name=NIH2003>{{cite web|title=Creutzfeldt–Jakob Disease Fact Sheet {{!}} National Institute of Neurological Disorders and Stroke|url=https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Fact-Sheets/Creutzfeldt-Jakob-Disease-Fact-Sheet|website=NINDS|access-date=16 July 2017|date=March 2003|url-status=live|archive-url=https://web.archive.org/web/20170704234755/https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Fact-Sheets/Creutzfeldt-Jakob-Disease-Fact-Sheet|archive-date=4 July 2017}}</ref> [[Opioids]] may be used to help with pain, while [[clonazepam]] or [[sodium valproate]] may help with involuntary movements.<ref name=NIH2003/> CJD affects about one per million people per year.<ref name=NIH2003/> Onset is typically around 60 years of age.<ref name=NIH2003/> The condition was first described in 1920.<ref name=NIH2003/> It is classified as a type of [[transmissible spongiform encephalopathy]].<ref>{{cite web|title=About CJD {{!}} Creutzfeldt–Jakob Disease, Classic (CJD) {{!}} Prion Disease|url=https://www.cdc.gov/prions/cjd/about.html|website=CDC|access-date=16 July 2017|date=11 February 2015|url-status=live|archive-url=https://web.archive.org/web/20170808104028/https://www.cdc.gov/prions/cjd/about.html|archive-date=8 August 2017}}</ref> Inherited CJD accounts for about 10% of prion disease cases.<ref name=Man2015/> Sporadic CJD is different from [[bovine spongiform encephalopathy]] (mad cow disease) and [[variant Creutzfeldt–Jakob disease]] (vCJD).<ref name=CDC2015Ind>{{cite web|title=Creutzfeldt–Jakob Disease, Classic (CJD) {{!}} Prion Diseases|url=https://www.cdc.gov/prions/cjd/index.html|website=CDC|access-date=16 July 2017|date=6 February 2015|url-status=live|archive-url=https://web.archive.org/web/20170718154357/https://www.cdc.gov/prions/cjd/index.html|archive-date=18 July 2017}}</ref>
{{tham khảo|30em}}

{{sơ khai y học}}
==Signs and symptoms==
<!--
[http://pathology.mc.duke.edu/neuropath/CNSlecture2/cjd.jpg] The spongiform look of the cortex cross-section is characteristic of CJD. -->
The first symptom of CJD is usually rapidly progressive [[dementia]], leading to [[Amnesia|memory loss]], [[Personality psychology|personality]] changes, and [[hallucination]]s. [[Myoclonus]] (jerky movements) typically occurs in 90% of cases, but may be absent at initial onset.<ref>{{Cite web|url=http://reference.medscape.com/viewarticle/881806_3|archive-url=https://web.archive.org/web/20170706181402/http://reference.medscape.com/viewarticle/881806_3|url-status=dead|archive-date=2017-07-06|title=A 49-Year-Old Man With Forgetfulness and Gait Impairment|website=reference.medscape.com/viewarticle/881806_3|access-date=2017-07-09}}</ref> Other frequently occurring features include [[anxiety (mood)|anxiety]], [[depression (mood)|depression]], [[paranoia]], [[obsessive-compulsive]] symptoms, and [[psychosis]].<ref>Murray ED, Buttner N, Price BH. (2012) Depression and Psychosis in Neurological Practice. In: Neurology in Clinical Practice, 6th Edition. Bradley WG, Daroff RB, Fenichel GM, Jankovic J (eds.) Butterworth Heinemann. April 12, 2012. {{ISBN|1437704344|978-1437704341}}</ref> This is accompanied by physical problems such as [[Speech communication|speech]] impairment, balance and coordination dysfunction ([[ataxia]]), changes in [[gait (human)|gait]], and rigid [[Human position|posture]]. In most people with CJD, these symptoms are accompanied by [[Dyskinesia|involuntary movements]]. The duration of the disease varies greatly, but sporadic (non-inherited) CJD can be fatal within months or even weeks.<ref>{{cite journal | vauthors = Brown P, Cathala F, Castaigne P, Gajdusek DC | title = Creutzfeldt-Jakob disease: clinical analysis of a consecutive series of 230 neuropathologically verified cases | journal = Annals of Neurology | volume = 20 | issue = 5 | pages = 597–602 | date = November 1986 | pmid = 3539001 | doi = 10.1002/ana.410200507 | s2cid = 7995631 }}</ref> Most victims die six months after initial symptoms appear, often of [[pneumonia]] due to impaired coughing reflexes. About 15% of people with CJD survive for two or more years.<ref name="Gambetti">{{cite web|last=Gambetti|first=Pierluigi|title=Creutzfeldt–Jakob Disease (CJD)|url=http://www.merckmanuals.com/home/sec06/ch090/ch090b.html|publisher=The Merck Manuals: Online Medical Library|access-date=2011-06-04|url-status=live|archive-url=https://web.archive.org/web/20110604015739/http://www.merckmanuals.com/home/sec06/ch090/ch090b.html|archive-date=2011-06-04}}</ref>

The symptoms of CJD are caused by the progressive [[cell death|death]] of the brain's [[neuron|nerve cells]], which are associated with the build-up of abnormal prion proteins forming in the brain. When brain tissue from a person with CJD is examined under a [[microscope]], many tiny holes can be seen where the nerve cells have died. Parts of the brain may resemble a sponge where the prions were infecting the areas of the brain.<ref>{{Cite journal|last1=Atalay|first1=Fatma Oz|last2=Tolunay|first2=Sahsine|last3=Ozgun|first3=Gonca|last4=Bekar|first4=Ahmet|last5=Zarifoglu|first5=Mehmet|date=2013|title=Creutzfeldt-jakob disease: report of four cases and review of the literature|journal=Turkish Journal of Pathology|volume=31|issue=2|pages=148–152|doi=10.5146/tjpath.2013.01195|pmid=24272930|issn=1018-5615|doi-access=free}}</ref>

==Cause==
CJD is a type of [[transmissible spongiform encephalopathy]] (TSE), which are caused by [[prion]]s.<ref name=CDC2019/> Prions are misfolded proteins that occur in the neurons of the central nervous system (CNS). They are thought to affect signaling processes, damaging neurons and resulting in degeneration that causes the spongiform appearance in the affected brain.<ref>{{cite book|title = Fundamentals of Pathology| last = Sattar | first = Husain A. |url=https://books.google.com/books?id=j-xRtAEACAAJ | name-list-style = vanc |page = 189| isbn = 9780983224631 | year = 2017 }}</ref>

The CJD prion is dangerous because it promotes [[Protein folding|refolding]] of native prion protein into the diseased state.<ref>{{cite journal | vauthors = Clarke AR, Jackson GS, Collinge J | title = The molecular biology of prion propagation | journal = Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences | volume = 356 | issue = 1406 | pages = 185–95 | date = February 2001 | pmid = 11260799 | pmc = 1088424 | doi = 10.1098/rstb.2000.0764 }}</ref> The number of misfolded protein molecules will increase [[exponential growth|exponentially]] and the process leads to a large quantity of insoluble protein in affected [[cell (biology)|cells]]. This mass of misfolded proteins disrupts neuronal cell function and causes cell death. Mutations in the gene for the prion protein can cause a misfolding of the dominantly alpha helical regions into beta pleated sheets. This change in conformation disables the ability of the protein to undergo digestion. Once the prion is transmitted, the defective proteins invade the brain and induce other prion protein molecules to misfold in a self-sustaining [[feedback loop]]. These neurodegenerative diseases are commonly called ''[[prion disease]]s''.<ref>{{cite journal |last1=Geschwind |first1=MD |title=Prion Diseases |journal=Continuum |date=2015 |volume=21 |issue=6 |pages=1612–1638 |doi=10.1212/CON.0000000000000251 |pmid=26633779 |pmc=4879966 }}</ref>

People can also develop CJD because they carry a mutation of the gene that codes for the prion protein (''PRNP''). This occurs in only 5–10% of all CJD cases. In sporadic cases, the misfolding of the prion protein is a process that is hypothesized to occur as a result of the effects of aging on cellular machinery, explaining why the disease often appears later in life.<ref name=NIH2003/><ref name=":0" /> An EU study determined that "87% of cases were sporadic, 8% genetic, 5% iatrogenic and less than 1% variant."<ref>{{cite journal | vauthors = Will RG, Alperovitch A, Poser S, Pocchiari M, Hofman A, Mitrova E, de Silva R, D'Alessandro M, Delasnerie-Laupretre N, Zerr I, van Duijn C | title = Descriptive epidemiology of Creutzfeldt-Jakob disease in six European countries, 1993-1995. EU Collaborative Study Group for CJD | journal = Annals of Neurology | volume = 43 | issue = 6 | pages = 763–7 | date = June 1998 | pmid = 9629846 | doi = 10.1002/ana.410430611 | s2cid = 13562215 }}</ref>

===Transmission===
[[File:Awv235f2p.jpg|thumb|upright=1.3|MRI of iCJD because of growth hormone]]
The defective protein can be transmitted by contaminated harvested human brain products, [[cornea]]l grafts,<ref>{{cite journal | vauthors = Armitage WJ, Tullo AB, Ironside JW | title = Risk of Creutzfeldt-Jakob disease transmission by ocular surgery and tissue transplantation | journal = Eye | volume = 23 | issue = 10 | pages = 1926–30 | date = October 2009 | pmid = 19136921 | doi = 10.1038/eye.2008.381 | doi-access = free }}</ref> [[Dura mater|dural]] grafts,<ref>{{cite journal | vauthors = Esmonde T, Lueck CJ, Symon L, Duchen LW, Will RG | title = Creutzfeldt-Jakob disease and lyophilised dura mater grafts: report of two cases | journal = Journal of Neurology, Neurosurgery, and Psychiatry | volume = 56 | issue = 9 | pages = 999–1000 | date = September 1993 | pmid = 8410042 | pmc = 489736 | doi = 10.1136/jnnp.56.9.999 }}</ref> or [[electrode]]<ref>{{cite journal | vauthors = Bernoulli C, Siegfried J, Baumgartner G, Regli F, Rabinowicz T, Gajdusek DC, Gibbs CJ | title = Danger of accidental person-to-person transmission of Creutzfeldt-Jakob disease by surgery | journal = Lancet | volume = 1 | issue = 8009 | pages = 478–9 | date = February 1977 | pmid = 65575 | doi = 10.1016/s0140-6736(77)91958-4 | s2cid = 26804024 }}</ref> implants and human growth hormone.<ref>{{cite journal | vauthors = Brown P, Brandel JP, Sato T, Nakamura Y, MacKenzie J, Will RG, Ladogana A, Pocchiari M, Leschek EW, Schonberger LB | title = Iatrogenic Creutzfeldt-Jakob disease, final assessment | journal = Emerging Infectious Diseases | volume = 18 | issue = 6 | pages = 901–7 | date = June 2012 | pmid = 22607808 | pmc = 3358170 | doi = 10.3201/eid1806.120116 }}</ref>

It can be familial (fCJD); or it may appear without clear risk factors (sporadic form: sCJD). In the familial form, a [[mutation]] has occurred in the [[gene]] for PrP, ''[[PRNP]]'', in that family. All types of CJD are transmissible irrespective of how they occur in the person.<ref>{{cite journal | vauthors = Brown P, Gibbs CJ, Rodgers-Johnson P, Asher DM, Sulima MP, Bacote A, Goldfarb LG, Gajdusek DC | title = Human spongiform encephalopathy: the National Institutes of Health series of 300 cases of experimentally transmitted disease | journal = Annals of Neurology | volume = 35 | issue = 5 | pages = 513–29 | date = May 1994 | pmid = 8179297 | doi = 10.1002/ana.410350504 | s2cid = 22496358 }}</ref>

It is thought that humans can contract the variant form of the disease by eating food from animals infected with [[bovine spongiform encephalopathy]] (BSE), the bovine form of TSE also known as ''mad cow disease''. However, it can also cause sCJD in some cases.<ref>[https://www.cidrap.umn.edu/news-perspective/2004/02/new-form-bse-resembles-sporadic-cjd New form of BSE resembles sporadic CJD]</ref><ref>{{cite journal | vauthors = Collinge J, Sidle KC, Meads J, Ironside J, Hill AF | s2cid = 4355186 | title = Molecular analysis of prion strain variation and the aetiology of 'new variant' CJD | journal = Nature | volume = 383 | issue = 6602 | pages = 685–90 | date = October 1996 | pmid = 8878476 | doi = 10.1038/383685a0 | bibcode = 1996Natur.383..685C }}</ref>

[[Cannibalism]] has also been implicated as a transmission mechanism for abnormal prions, causing the disease known as [[Kuru (disease)|kuru]], once found primarily among women and children of the [[Fore people]] in [[Papua New Guinea]].<ref>{{cite journal | vauthors = Collinge J, Whitfield J, McKintosh E, Beck J, Mead S, Thomas DJ, Alpers MP | title = Kuru in the 21st century--an acquired human prion disease with very long incubation periods | journal = Lancet | volume = 367 | issue = 9528 | pages = 2068–74 | date = June 2006 | pmid = 16798390 | doi = 10.1016/s0140-6736(06)68930-7 | s2cid = 11506094 }}</ref> While the men of the tribe ate the muscle tissue of the deceased, women and children consumed other parts, such as the brain, and were more likely than men to contract kuru from infected tissue.{{citation needed|date=May 2021}}

Prions, the [[infectious agent]] of CJD, may not be inactivated by means of routine [[surgical instrument]] [[Autoclave|sterilization]] procedures. The [[World Health Organization]] and the US [[Centers for Disease Control and Prevention]] recommend that instrumentation used in such cases be immediately destroyed after use; short of destruction, it is recommended that heat and chemical decontamination be used in combination to process instruments that come in contact with high-infectivity tissues. [[Thermal depolymerization]] also destroys prions in infected organic and inorganic matter, since the process chemically attacks protein at the molecular level, although more effective and practical methods involve destruction by combinations of detergents and enzymes similar to biological washing powders.<ref>{{cite journal | vauthors = Jackson GS, McKintosh E, Flechsig E, Prodromidou K, Hirsch P, Linehan J, Brandner S, Clarke AR, Weissmann C, Collinge J | title = An enzyme-detergent method for effective prion decontamination of surgical steel | journal = The Journal of General Virology | volume = 86 | issue = Pt 3 | pages = 869–78 | date = March 2005 | pmid = 15722550 | doi = 10.1099/vir.0.80484-0 | doi-access = free }}</ref>

==Diagnosis==

Testing for CJD has historically been problematic, due to nonspecific nature of early symptoms and difficulty in safely obtaining brain tissue for confirmation. The diagnosis may initially be suspected in a person with rapidly progressing dementia, particularly when they are also found with the characteristic medical [[Medical sign|signs]] and [[symptom]]s such as [[Myoclonus|involuntary muscle jerking]],<ref>{{cite book|last=Sattar|first=Hussain A. |title=Fundamentals of Pathology|year=2011|url=https://archive.org/details/fundamentalspath00satt|url-access=limited|publisher=Pathoma LLC.|location=Chicago |page=[https://archive.org/details/fundamentalspath00satt/page/n184 187] |isbn=9780983224600 }}</ref> [[Ataxia|difficulty with coordination/balance and walking]], and visual disturbances.<ref>{{Cite web|url=https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Fact-Sheets/Creutzfeldt-Jakob-Disease-Fact-Sheet|title=Creutzfeldt–Jakob Disease Fact Sheet {{!}} National Institute of Neurological Disorders and Stroke|website=www.ninds.nih.gov|access-date=2018-01-13}}</ref> Further testing can support the diagnosis and may include:
* [[Electroencephalography]] – may have characteristic generalized periodic sharp wave pattern. Periodic sharp wave complexes develop in half of the people with sporadic CJD, particularly in the later stages.<ref name="CJD mimics and chameleons">{{cite journal | vauthors = Mead S, Rudge P | title = CJD mimics and chameleons | journal = Practical Neurology | volume = 17 | issue = 2 | pages = 113–121 | date = April 2017 | pmid = 28153848 | pmc = 5520355 | doi = 10.1136/practneurol-2016-001571 }}</ref>
* [[Cerebrospinal fluid]] (CSF) analysis for elevated levels of [[14-3-3 protein]] could be supportive in the diagnosis of sCJD. However, a positive result should not be regarded as sufficient for the diagnosis.<ref>{{cite journal | vauthors = Satoh J, Kurohara K, Yukitake M, Kuroda Y | s2cid = 21795464 | title = The 14-3-3 protein detectable in the cerebrospinal fluid of patients with prion-unrelated neurological diseases is expressed constitutively in neurons and glial cells in culture | journal = European Neurology | volume = 41 | issue = 4 | pages = 216–25 | date = 1999 | pmid = 10343153 | doi = 10.1159/000008054 }}</ref><ref>{{cite journal | vauthors = Geschwind MD, Martindale J, Miller D, DeArmond SJ, Uyehara-Lock J, Gaskin D, Kramer JH, Barbaro NM, Miller BL | title = Challenging the clinical utility of the 14-3-3 protein for the diagnosis of sporadic Creutzfeldt-Jakob disease | journal = Archives of Neurology | volume = 60 | issue = 6 | pages = 813–6 | date = June 2003 | pmid = 12810484 | doi = 10.1001/archneur.60.6.813 | doi-access = free }}</ref><ref>{{cite journal | vauthors = Chitravas N, Jung RS, Kofskey DM, Blevins JE, Gambetti P, Leigh RJ, Cohen ML | title = Treatable neurological disorders misdiagnosed as Creutzfeldt-Jakob disease | journal = Annals of Neurology | volume = 70 | issue = 3 | pages = 437–44 | date = September 2011 | pmid = 21674591 | pmc = 3170496 | doi = 10.1002/ana.22454 }}</ref> The [[Real-Time Quaking-Induced Conversion]] ([[RT-QuIC]]) assay has a diagnostic sensitivity of more than 80% and a specificity approaching 100%, tested in detecting [[PrpSc|PrP<SUP>Sc</SUP>]] in CSF samples of people with CJD.<ref>{{cite journal | vauthors = Sano K, Satoh K, Atarashi R, Takashima H, Iwasaki Y, Yoshida M, Sanjo N, Murai H, Mizusawa H, Schmitz M, Zerr I, Kim YS, Nishida N | title = Early detection of abnormal prion protein in genetic human prion diseases now possible using real-time QUIC assay | journal = PLOS ONE | volume = 8 | issue = 1 | pages = e54915 | date = 2013-01-25 | pmid = 23372790 | pmc = 3556051 | doi = 10.1371/journal.pone.0054915 | bibcode = 2013PLoSO...854915S | doi-access = free }}</ref><ref>{{cite journal | vauthors = Foutz A, Appleby BS, Hamlin C, Liu X, Yang S, Cohen Y, Chen W, Blevins J, Fausett C, Wang H, Gambetti P, Zhang S, Hughson A, Tatsuoka C, Schonberger LB, Cohen ML, Caughey B, Safar JG | title = Diagnostic and prognostic value of human prion detection in cerebrospinal fluid | journal = Annals of Neurology | volume = 81 | issue = 1 | pages = 79–92 | date = January 2017 | pmid = 27893164 | pmc = 5266667 | doi = 10.1002/ana.24833 }}</ref><ref>{{cite journal | vauthors = Bongianni M, Orrù C, Groveman BR, Sacchetto L, Fiorini M, Tonoli G, Triva G, Capaldi S, Testi S, Ferrari S, Cagnin A, Ladogana A, Poleggi A, Colaizzo E, Tiple D, Vaianella L, Castriciano S, Marchioni D, Hughson AG, Imperiale D, Cattaruzza T, Fabrizi GM, Pocchiari M, Monaco S, Caughey B, Zanusso G | s2cid = 40578363 | title = Diagnosis of Human Prion Disease Using Real-Time Quaking-Induced Conversion Testing of Olfactory Mucosa and Cerebrospinal Fluid Samples | journal = JAMA Neurology | volume = 74 | issue = 2 | pages = 155–162 | date = February 2017 | pmid = 27942718 | doi = 10.1001/jamaneurol.2016.4614 }}</ref> It is therefore suggested as a high-value diagnostic method for the disease.
* [[MRI]] of the brain – often shows high signal intensity in the caudate nucleus and putamen bilaterally on T2-weighted images.

In recent years, studies have shown that the tumour marker [[Neuron-specific enolase]] (NSE) is often elevated in CJD cases; however, its diagnostic utility is seen primarily when combined with a test for the 14-3-3 protein.<ref>{{cite journal | vauthors = Sanchez-Juan P, Green A, Ladogana A, Cuadrado-Corrales N, Sáanchez-Valle R, Mitrováa E, Stoeck K, Sklaviadis T, Kulczycki J, Hess K, Bodemer M, Slivarichová D, Saiz A, Calero M, Ingrosso L, Knight R, Janssens AC, van Duijn CM, Zerr I | s2cid = 23306766 | title = CSF tests in the differential diagnosis of Creutzfeldt-Jakob disease | journal = Neurology | volume = 67 | issue = 4 | pages = 637–43 | date = August 2006 | pmid = 16924018 | doi = 10.1212/01.wnl.0000230159.67128.00 }}</ref> {{As of|2010}}, screening tests to identify infected asymptomatic individuals, such as blood donors, are not yet available, though methods have been proposed and evaluated.<ref>{{cite journal | vauthors = Tattum MH, Jones S, Pal S, Khalili-Shirazi A, Collinge J, Jackson GS | title = A highly sensitive immunoassay for the detection of prion-infected material in whole human blood without the use of proteinase K | journal = Transfusion | volume = 50 | issue = 12 | pages = 2619–27 | date = December 2010 | pmid = 20561299 | doi = 10.1111/j.1537-2995.2010.02731.x | s2cid = 33032755 | url = http://discovery.ucl.ac.uk/146121/1/Tattum_et_al_A_highly_sensitive_immunoassay_for_the_detection_of_prion_infected_ELISA.pdf | type = Submitted manuscript }}</ref>

=== Imaging ===
Imaging of the brain may be performed during medical evaluation, both to rule out other causes and to obtain supportive evidence for diagnosis. Imaging findings are variable in their appearance, and also variable in sensitivity and specificity.<ref>{{cite journal | vauthors = Fragoso DC, Gonçalves Filho AL, Pacheco FT, Barros BR, Aguiar Littig I, Nunes RH, Maia Júnior AC, da Rocha AJ | title = Imaging of Creutzfeldt-Jakob Disease: Imaging Patterns and Their Differential Diagnosis | journal = Radiographics | volume = 37 | issue = 1 | pages = 234–257 | date = 2017-01-01 | pmid = 28076012 | doi = 10.1148/rg.2017160075 | doi-access = free }}</ref> While imaging plays a lesser role in diagnosis of CJD,<ref name=":1">{{cite journal | vauthors = Finkenstaedt M, Szudra A, Zerr I, Poser S, Hise JH, Stoebner JM, Weber T | title = MR imaging of Creutzfeldt-Jakob disease | journal = Radiology | volume = 199 | issue = 3 | pages = 793–8 | date = June 1996 | pmid = 8638007 | doi = 10.1148/radiology.199.3.8638007 }}</ref> characteristic findings on brain MRI in some cases may precede onset of clinical manifestations.<ref>{{cite journal | vauthors = Ukisu R, Kushihashi T, Kitanosono T, Fujisawa H, Takenaka H, Ohgiya Y, Gokan T, Munechika H | title = Serial diffusion-weighted MRI of Creutzfeldt-Jakob disease | journal = AJR. American Journal of Roentgenology | volume = 184 | issue = 2 | pages = 560–6 | date = February 2005 | pmid = 15671380 | doi = 10.2214/ajr.184.2.01840560 }}</ref>

Brain MRI is the most useful imaging modality for changes related to CJD. Of the MRI sequences, diffuse-weighted imaging sequences are most sensitive. Characteristic findings are as follows:
[[File:DwMRI FDG PET and histology in sCJD.tif|thumb|dwMRI, FDG PET and post mortem histology from a patient who presented with sCJD aged 66]]
* Focal or diffuse diffusion-restriction involving the cerebral cortex and/or basal ganglia. In about 24% of cases DWI shows only cortical hyperintensity; in 68%, cortical and subcortical abnormalities; and in 5%, only subcortical anomalies.<ref>{{cite journal | vauthors = Young GS, Geschwind MD, Fischbein NJ, Martindale JL, Henry RG, Liu S, Lu Y, Wong S, Liu H, Miller BL, Dillon WP | title = Diffusion-weighted and fluid-attenuated inversion recovery imaging in Creutzfeldt-Jakob disease: high sensitivity and specificity for diagnosis | journal = AJNR. American Journal of Neuroradiology | volume = 26 | issue = 6 | pages = 1551–62 | date = June–July 2005 | pmid = 15956529 | pmc = 8149066 | url = http://www.ajnr.org/cgi/content/full/26/6/1551 | archive-url = https://web.archive.org/web/20080907152111/http://www.ajnr.org/cgi/content/full/26/6/1551 | url-status = live | archive-date = 2008-09-07 }}</ref> The most iconic and striking cortical abnormality has been called "cortical ribboning" or "cortical ribbon sign" due to hyperintensities resembling ribbons appearing in the cortex on MRI.<ref>{{cite journal | vauthors = Abdulmassih R, Min Z | title = An ominous radiographic feature: cortical ribbon sign | journal = Internal and Emergency Medicine | volume = 11 | issue = 2 | pages = 281–3 | date = March 2016 | pmid = 26238299 | doi = 10.1007/s11739-015-1287-4 | doi-access = free }}</ref> The involvement of the thalamus can be found in sCJD, is even stronger and constant in vCJD.<ref>{{cite journal | vauthors = Tschampa HJ, Mürtz P, Flacke S, Paus S, Schild HH, Urbach H | title = Thalamic involvement in sporadic Creutzfeldt-Jakob disease: a diffusion-weighted MR imaging study | journal = AJNR. American Journal of Neuroradiology | volume = 24 | issue = 5 | pages = 908–15 | date = May 2003 | pmid = 12748093 | pmc = 7975779 | url = http://www.ajnr.org/cgi/content/full/24/5/908 | archive-url = https://web.archive.org/web/20081010214648/http://www.ajnr.org/cgi/content/full/24/5/908 | url-status = live | archive-date = 10 October 2008 }}</ref>
* Varying degree of symmetric T2 hyperintense signal changes in the [[basal ganglia]] (i.e., caudate and putamen), and to a lesser extent [[globus pallidus]] and [[occipital cortex]].<ref name=":1" />
* Cerebellar atrophy

Brain FDG PET-CT tends to be markedly abnormal, and is increasingly used in the investigation of dementias.
* Patients suffering from CJD will normally have hypometabolism on FDG PET.<ref>{{cite journal | vauthors = Morley NC, Hofer M, Wilkinson P, Bradley KM |title=18FDG PET-CT in sporadic Creutzfeldt-Jakob disease, correlated with MRI and histology |journal=World J Nucl Med |date=2021 |volume=20 |issue=4 |page=411 |doi=10.4103/wjnm.wjnm_5_21 |s2cid=244465297 |url=http://www.wjnm.org/text.asp?2021/20/4/411/328210 |access-date=25 November 2021}}</ref>

=== Histopathology ===
[[Image:SpongiformChangeCJD.jpg|thumb|upright=1.3|Spongiform change in CJD]]
Testing of tissue remains the most definitive way of confirming the diagnosis of CJD, although it must be recognized that even biopsy is not always conclusive.{{citation needed|date=May 2021}}

In one-third of people with sporadic CJD, deposits of "prion protein (scrapie)," [[PrpSc|PrP<SUP>Sc</SUP>]], can be found in the [[skeletal muscle]] and/or the [[spleen]].{{Citation needed|date=August 2008}} Diagnosis of vCJD can be supported by biopsy of the tonsils, which harbor significant amounts of PrP<sup>Sc</sup>; however, [[biopsy]] of brain tissue is the definitive diagnostic test for all other forms of prion disease. Due to its invasiveness, biopsy will not be done if clinical suspicion is sufficiently high or low. A negative biopsy does not rule out CJD, since it may predominate in a specific part of the brain.<ref name="ReferenceA">Sternberg's Diagnostic Surgical Pathology, 5th edition.</ref>

The classic [[histologic]] appearance is spongiform change in the gray matter: the presence of many round vacuoles from one to 50 micrometers in the [[neuropil]], in all six cortical layers in the cerebral cortex or with diffuse involvement of the cerebellar molecular layer.<ref>{{Cite journal|last=Liberski, P.P.|date=2004|title=Spongiform change – an electron microscopic view.|journal=Folia Neuropathologica|volume=42, suppl B|pages=59–70|pmid=16903142}}</ref> These vacuoles appear glassy or eosinophilic and may coalesce. Neuronal loss and gliosis are also seen.<ref>{{Cite web|url=http://library.med.utah.edu/WebPath/TUTORIAL/CNS/CNSDG.html|title=Pathology of Degenerative CNS Diseases|website=library.med.utah.edu}}</ref> Plaques of amyloid-like material can be seen in the neocortex in some cases of CJD.<ref>{{Cite web|last1=G. B.|first1=Dudhatra|last2=Kumar|first2=Avinash|last3=C. M.|first3=Modi|last4=M. M.|first4=Awale|last5=H. B.|first5=Patel|last6=S. K.|first6=Mody|date=2012-08-14|title=Transmissible Spongiform Encephalopathies Affecting Humans|url=https://www.hindawi.com/journals/isrn/2013/387925/|access-date=2021-08-13|website=ISRN Infectious Diseases|language=en}}</ref>

However, extra-neuronal [[vacuolization]] can also be seen in other disease states. Diffuse cortical vacuolization occurs in [[Alzheimer's disease]], and superficial cortical vacuolization occurs in [[ischemia]] and [[frontotemporal dementia]]. These vacuoles appear clear and punched-out. Larger vacuoles encircling neurons, vessels, and [[glia]] are a possible processing artifact.<ref name="ReferenceA"/>

===Classification===
Types of CJD include:<ref name=Budka2015rev>{{cite journal | vauthors = Budka H, Will RG | title = The end of the BSE saga: do we still need surveillance for human prion diseases? | journal = Swiss Medical Weekly | volume = 145 | pages = w14212 | date = 12 November 2015 | pmid = 26715203 | doi = 10.4414/smw.2015.14212 | url = http://www.zora.uzh.ch/id/eprint/115870/1/smw-2015-14212.pdf | doi-access = free }}</ref>
* Sporadic (sCJD), caused by the spontaneous misfolding of prion-protein in an individual.<ref name=":0">{{cite journal | vauthors = Ridley RM, Baker HF, Crow TJ | title = Transmissible and non-transmissible neurodegenerative disease: similarities in age of onset and genetics in relation to aetiology | journal = Psychological Medicine | volume = 16 | issue = 1 | pages = 199–207 | date = February 1986 | pmid = 3961045 | doi = 10.1017/s0033291700002634 }}</ref> This accounts for 85% of cases of CJD.<ref name=whoint/>
* Familial (fCJD), caused by an inherited mutation in the prion-protein gene.<ref name=Budka2015rev/> This accounts for the majority of the other 15% of cases of CJD.<ref name=whoint/>
* Acquired CJD, caused by contamination with tissue from an infected person, usually as the result of a medical procedure ([[Iatrogenesis|iatrogenic]] CJD). Medical procedures that are associated with the spread of this form of CJD include blood transfusion from the infected person, use of human-derived pituitary growth hormones, gonadotropin hormone therapy, and [[corneal]] and [[Meninges|meningeal]] [[Organ transplantation|transplants]].<ref name=Budka2015rev/><ref name=whoint>{{Cite web|url=https://www.who.int/mediacentre/factsheets/fs180/en/|archive-url=https://web.archive.org/web/20160204002108/http://www.who.int/mediacentre/factsheets/fs180/en/|url-status=dead|title=who.int: "Fact sheets no 180: Variant Creutzfeldt–Jakob disease" Feb 2012 ed.|archive-date=February 4, 2016}}</ref><ref>{{cite journal | vauthors = Bonda DJ, Manjila S, Mehndiratta P, Khan F, Miller BR, Onwuzulike K, Puoti G, Cohen ML, Schonberger LB, Cali I | title = Human prion diseases: surgical lessons learned from iatrogenic prion transmission | journal = Neurosurgical Focus | volume = 41 | issue = 1 | pages = E10 | date = July 2016 | pmid = 27364252 | pmc = 5082740 | doi = 10.3171/2016.5.FOCUS15126 }}</ref> [[Variant Creutzfeldt–Jakob disease]] (vCJD) is a type of acquired CJD potentially acquired from [[bovine spongiform encephalopathy]] or caused by consuming food contaminated with [[prions]].<ref name=Budka2015rev/><ref>{{cite web |title=Creutzfeldt-Jakob Disease Fact Sheet {{!}} National Institute of Neurological Disorders and Stroke |url=https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Fact-Sheets/Creutzfeldt-Jakob-Disease-Fact-Sheet |website=NINDS |access-date=21 November 2018}}</ref>

{| class="wikitable" border="1"
|+Clinical and pathologic characteristics<ref>{{cite journal | vauthors = Belay ED, Schonberger LB | title = Variant Creutzfeldt-Jakob disease and bovine spongiform encephalopathy | journal = Clinics in Laboratory Medicine | volume = 22 | issue = 4 | pages = 849–62, v-vi | date = December 2002 | pmid = 12489284 | doi = 10.1016/S0272-2712(02)00024-0 }}</ref>
|-----
! Characteristic !! Classic CJD !! Variant CJD
|-----
| Median age at death || 68 years || 28 years
|-----
| Median duration of illness || 4–5 months
| 13–14 months
|-----
| Clinical signs and symptoms || Dementia; early neurologic signs
| Prominent psychiatric/behavioral symptoms; painful [[dysesthesias]]; delayed neurologic signs
|-----
| Periodic sharp waves on [[electroencephalogram]]
| Often present || Often absent
|-----
| Signal hyperintensity in the [[caudate nucleus]] and [[putamen]] on diffusion-weighted and [[FLAIR MRI]]
| Often present || Often absent
|-----
| [[Pulvinar nuclei|Pulvinar]] sign-bilateral high signal intensities on axial [[Magnetic resonance imaging#Fluid attenuated inversion recovery (FLAIR)|FLAIR MRI]]. Also posterior thalamic involvement on sagittal T2 sequences || Not reported
| Present in &gt;75% of cases
|-----
| [[Immunohistochemical staining|Immunohistochemical analysis]] of brain tissue
| Variable accumulation.
| Marked accumulation of protease-resistant prion protein
|-----
| Presence of agent in [[lymphoid]] tissue
| Not readily detected || Readily detected
|-----
| Increased [[glycoform]] ratio on [[immunoblot]] analysis of protease-resistant prion protein
| Not reported
| Marked accumulation of protease-resistant prion protein
|-----
| Presence of amyloid plaques in brain tissue
| May be present || May be present
|}

== Treatment ==
As of 2022, there is no cure or effective treatment for CJD.<ref name=Manix2015rev/> Some of the symptoms like [[myoclonus|twitching]] can be managed, but otherwise treatment is [[palliative care]].<ref name=Manix2015rev>{{cite journal | vauthors = Manix M, Kalakoti P, Henry M, Thakur J, Menger R, Guthikonda B, Nanda A | title = Creutzfeldt-Jakob disease: updated diagnostic criteria, treatment algorithm, and the utility of brain biopsy | journal = Neurosurgical Focus | volume = 39 | issue = 5 | pages = E2 | date = November 2015 | pmid = 26646926 | doi = 10.3171/2015.8.FOCUS15328 | doi-access = free }}</ref> Psychiatric symptoms like anxiety and depression can be treated with sedatives and antidepressants. Myoclonic jerks can be handled with clonazepam or sodium valproate. Opiates can help in pain.<ref>{{Cite web|url=https://www.nhs.uk/conditions/creutzfeldt-jakob-disease-cjd/treatment/|title=Treatment|website=nhs.uk|access-date=2018-04-17|date=2017-10-23}}</ref> Seizures are very uncommon but can nevertheless be treated with antiepileptic drugs.<ref>{{cite journal | vauthors = Ng MC, Westover MB, Cole AJ | title = Treating seizures in Creutzfeldt-Jakob disease | journal = Epilepsy & Behavior Case Reports | volume = 2 | pages = 75–9 | date = 2014-02-07 | pmid = 25667875 | pmc = 4308028 | doi = 10.1016/j.ebcr.2014.01.004 }}</ref>

== Prognosis ==
{{Anchor|Outcomes}}
The condition is universally fatal. As of 1981, nobody is known to have lived longer than 2.5 years after the onset of CJD symptoms.<ref name="auto">{{cite journal | vauthors = Mizutani T, Okumura A, Oda M, Shiraki H | title = Panencephalopathic type of Creutzfeldt-Jakob disease: primary involvement of the cerebral white matter | journal = Journal of Neurology, Neurosurgery, and Psychiatry | volume = 44 | issue = 2 | pages = 103–15 | date = February 1981 | pmid = 7012278 | pmc = 490840 | doi = 10.1136/jnnp.44.2.103 }}</ref>/ The longest recorded survivor of variant Creutzfeldt–Jakob disease (vCJD) was [[Jonathan Simms]], a Northern Irish man who lived 10 years after his diagnosis.<ref>{{Cite news|url=https://www.bbc.co.uk/news/uk-northern-ireland-12667709|title = Belfast man with VCJD dies after long battle|work = BBC News|date = 7 March 2011}}</ref><ref>"List of names – Justice for Andy" justiceforandy.com </ref>

== Epidemiology ==
[[Centers for Disease Control and Prevention|CDC]] monitors the occurrence of CJD in the United States through periodic reviews of national mortality data. According to the [[Centers for Disease Control and Prevention|CDC]]:<ref name="CDC1">{{cite web |title = CJD (Creutzfeldt–Jakob Disease, Classic) |url = https://www.cdc.gov/ncidod/dvrd/cjd/index.htm |publisher = Centers for Disease Control and Prevention |date = 2008-02-26 |access-date = 2009-06-20 |url-status = dead |archive-url = https://web.archive.org/web/20090506212244/http://www.cdc.gov/ncidod/dvrd/cjd/index.htm |archive-date = 2009-05-06 }}</ref><ref name="VCJD1">{{cite web |title = vCJD (Variant Creutzfeldt–Jakob Disease) |url = https://www.cdc.gov/ncidod/dvrd/vcjd/factsheet_nvcjd.htm |publisher = Centers for Disease Control and Prevention |date = 2007-01-04 |access-date = 2009-06-20 |url-status = dead |archive-url = https://web.archive.org/web/20090507193309/http://www.cdc.gov/ncidod/dvrd/vcjd/factsheet_nvcjd.htm |archive-date = 2009-05-07 }}
</ref>
* CJD occurs worldwide at a rate of about 1 case per million population per year.
* On the basis of mortality surveillance from 1979 to 1994, the annual [[incidence (epidemiology)|incidence]] of CJD remained stable at approximately 1 case per [[million]] people in the United States.
* In the United States, CJD deaths among people younger than 30 years of age are extremely rare (fewer than five deaths per [[1000000000 (number)|billion]] per year).
* The disease is found most frequently in people 55–65 years of age, but cases can occur in people older than 90 years and younger than 55 years of age.
* In more than 85% of cases, the duration of CJD is less than 1 year (median: four months) after the onset of symptoms.

Further information from the CDC:<ref name=":2">[https://www.cdc.gov/prions/cjd/occurrence-transmission.html "Occurrence and Transmission | Creutzfeldt-Jakob Disease, Classic (CJD) | Prion Disease | CDC".] ''www.cdc.gov''. 2019-05-08. Retrieved 2020-11-04.</ref>
* Risk of developing CJD increases with age.
* CJD incidence was 3.5 cases per million among those over 50 years of age between 1979 and 2017.
* Approximately 85% of CJD cases are sporadic and 10-15% of CJD cases are due to inherited mutations of the prion protein gene.
* CJD deaths and age-adjusted death rate in the United States indicate an increasing trend in the number of deaths between 1979 and 2017.

Although not fully understood, additional information suggests that CJD rates in African American and nonwhite groups are lower than in whites. While the mean onset is approximately 67 years of age, cases of sCJD have been reported as young as 17 years and over 80 years of age. Mental capabilities rapidly deteriorate and the average amount of time from onset of symptoms to death is 7 to 9 months.<ref name=":12">{{Cite book|last1=Bosque|first1=Patrick|url=https://www.clinicalkey.com/#!/content/book/3-s2.0-B978032348255400179X?scrollTo=#hl0000833|title=Prions and Prion Disease of the Central Nervous System (Transmissible Neurodegenerative Diseases)|last2=Tyler|first2=Kenneth|publisher=Elsevier, Inc|year=2020|location=www.clinicalkey.com|pages=2288–2300}}</ref>

According to a 2020 systematic review on the international epidemiology of CJD:<ref name=":02">Uttley L, Carroll C, Wong R, Hilton DA, Stevenson M. [https://www.clinicalkey.com/#!/content/playContent/1-s2.0-S1473309919306152?returnurl=null&referrer=null Creutzfeldt-Jakob disease: a systematic review of global incidence, prevalence, infectivity, and incubation.] Lancet Infect Dis. 2020 Jan;20(1):e2-e10. [https://www.clinicalkey.com/#!/content/playContent/1-s2.0-S1473309919306152?returnurl=null&referrer=null doi: 10.1016/S1473-3099(19)30615-2.] PMID: [https://www.clinicalkey.com/#!/content/playContent/1-s2.0-S1473309919306152?returnurl=null&referrer=null 31876504.]</ref>
* Surveillance studies from 2005 and newer show the estimated global incidence is 1–2 cases per million population per year.
* Sporadic CJD (sCJD) incidence increased from the years 1990–2018 in the UK.
* Probable or definite sCJD deaths also increased from the years 1996–2018 in twelve additional countries.
* CJD incidence is greatest in those over the age of 55 years old, with an average age of 67 years old.

The intensity of CJD surveillance increases the number of reported cases, often in countries where CJD epidemics have occurred in the past and where surveillance resources are greatest.<ref name=":02" /> An increase in surveillance and reporting of CJD is most likely in response to BSE and vCJD.<ref name=":12" /> Possible factors attributing to an increase of CJD incidence are due to an aging population, population increase, clinician awareness, and more accurate diagnosis methods. Since CJD symptoms are similar to other neurological conditions, it is also possible that CJD is mistaken for stroke, acute nephropathy, general dementia, and hyperparathyroidism.<ref name=":02" />

== History ==
The disease was first described by German [[neurologist]]s [[Hans Gerhard Creutzfeldt]] in 1920 and shortly afterward by [[Alfons Maria Jakob]], giving it the name Creutzfeldt–Jakob. Some of the clinical findings described in their first papers do not match current criteria for Creutzfeldt–Jakob disease, and it has been speculated that at least two of the people in initial studies were suffering from a different ailment.<ref>{{Cite book | vauthors = Ironside JW |date=1996 |chapter=Neuropathological diagnosis of human prion disease; morphological studies|title=Prion Diseases | veditors = Baker HF, Ridley RM |volume=3|pages=35–57 |isbn=978-0-89603-342-9|doi=10.1385/0896033422}}</ref> An early description of familial CJD stems from the German psychiatrist and neurologist [[Friedrich Meggendorfer]] (1880–1953).<ref>{{cite journal | vauthors = Meggendorfer F | year = 1930 | title = Klinische und genealogische Beobachtungen bei einem Fall von spastischer Pseudokosklerose Jakobs | journal = Zeitschrift für die Gesamte Neurologie und Psychiatrie | volume = 128 | issue = 1–4| pages = 337–41 | doi=10.1007/bf02864269}}</ref><ref>{{cite journal | vauthors = Gambetti P, Kong Q, Zou W, Parchi P, Chen SG | title = Sporadic and familial CJD: classification and characterisation | journal = British Medical Bulletin | volume = 66 | pages = 213–39 | year = 2003 | pmid = 14522861 | doi = 10.1093/bmb/66.1.213 | doi-access = free }}</ref> A study published in 1997 counted more than 100 cases worldwide of transmissible CJD and new cases continued to appear at the time.<ref name=ricketts>{{cite journal | vauthors = Ricketts MN, Cashman NR, Stratton EE, ElSaadany S | title = Is Creutzfeldt-Jakob disease transmitted in blood? | journal = Emerging Infectious Diseases | volume = 3 | issue = 2 | pages = 155–63 | date = 1997 | pmid = 9204296 | pmc = 2627622 | doi = 10.3201/eid0302.970208 }}</ref>

The first report of suspected [[Iatrogenesis|iatrogenic]] CJD was published in 1974. Animal experiments showed that corneas of infected animals could transmit CJD, and the causative agent spreads along visual pathways. A second case of CJD associated with a corneal transplant was reported without details. In 1977, CJD transmission caused by silver electrodes previously used in the brain of a person with CJD was first reported. Transmission occurred despite the decontamination of the electrodes with ethanol and formaldehyde. Retrospective studies identified four other cases likely of similar cause. The rate of transmission from a single contaminated instrument is unknown, although it is not 100%. In some cases, the exposure occurred weeks after the instruments were used on a person with CJD.<ref name=ricketts/> In the 1980s it was discovered that [[Lyodura]], a dura mater transplant product was shown to transmit Creutzfeldt–Jakob disease from the donor to the recipient. This led to the product being banned in Canada but it was used in other countries such as Japan until 1993.<ref>{{cite journal | vauthors = Ae R, Hamaguchi T, Nakamura Y, Yamada M, Tsukamoto T, Mizusawa H, Belay ED, Schonberger LB | title = Update: Dura Mater Graft-Associated Creutzfeldt-Jakob Disease - Japan, 1975-2017 | journal = MMWR. Morbidity and Mortality Weekly Report | volume = 67 | issue = 9 | pages = 274–278 | date = March 2018 | pmid = 29518068 | pmc = 5844283 | doi = 10.15585/mmwr.mm6709a3 }}</ref>

A review article published in 1979 indicated that 25 dura mater cases had occurred by that date in Australia, Canada, Germany, Italy, Japan, New Zealand, Spain, the United Kingdom, and the United States.<ref name=ricketts/>

By 1985, a series of case reports in the United States showed that when injected, cadaver-extracted pituitary [[human growth hormone]] could transmit CJD to humans.<ref name=ricketts/>

In 1992, it was recognized that human [[gonadotropin]] administered by injection could also transmit CJD from person to person.<ref name=ricketts/>

[[Stanley B. Prusiner]] of the [[University of California, San Francisco]] (UCSF) was awarded the [[Nobel Prize in Physiology or Medicine]] in 1997 "for his discovery of Prions—a new biological principle of infection".<ref name="Nobel">{{cite web | url=https://www.nobelprize.org/nobel_prizes/medicine/laureates/1997/ | title=The Nobel Prize in Physiology or Medicine 1997: Stanley B. Prusiner | publisher=NobelPrize.org | access-date=2011-02-21 | url-status=live | archive-url=https://web.archive.org/web/20110220075157/http://nobelprize.org/nobel_prizes/medicine/laureates/1997/ | archive-date=2011-02-20 }}</ref> However, [[Yale University]] [[Neuropathology|neuropathologist]] [[Laura Manuelidis]] has challenged the prion protein (PrP) explanation for the disease. In January 2007, she and her colleagues reported that they had found a [[virus]]-like particle in naturally and experimentally infected animals. "The high infectivity of comparable, isolated virus-like particles that show no intrinsic PrP by antibody labeling, combined with their loss of infectivity when nucleic acid–protein complexes are disrupted, make it likely that these 25-nm particles are the causal TSE virions".<ref name="Manuelidis2007">{{cite journal | vauthors = Manuelidis L, Yu ZX, Barquero N, Banquero N, Mullins B | title = Cells infected with scrapie and Creutzfeldt-Jakob disease agents produce intracellular 25-nm virus-like particles | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 104 | issue = 6 | pages = 1965–70 | date = February 2007 | pmid = 17267596 | pmc = 1794316 | doi = 10.1073/pnas.0610999104 | bibcode = 2007PNAS..104.1965M | doi-access = free }}</ref>

=== Australia ===
Australia has documented 10 cases of healthcare-acquired CJD (iatrogenic or ICJD). Five of the deaths resulted after the patients, who were in treatment either for infertility or short stature, were treated using contaminated pituitary extract hormone but no new cases have been noted since 1991. The other five deaths occurred due to dura grafting procedures that were performed during brain surgery, in which the covering of the brain is repaired. There have been no other ICJD deaths documented in Australia due to transmission during healthcare procedures.<ref name="Health Australia">[http://ideas.health.vic.gov.au/diseases/cjd-facts.asp Creutzfeldt–Jakob Disease (CJD) – the facts.] Infectious Diseases Epidemiology & Surveillance – Department of Health, Victoria, Australia {{webarchive|url=https://web.archive.org/web/20150628234351/http://ideas.health.vic.gov.au/diseases/cjd-facts.asp |date=2015-06-28}}</ref>

However, Carol Willesee, the ex-wife of Australian reporter [[Mike Willesee]], died of the sporadic form of the disease in December 2006.<ref name="Health Australia" /><ref>{{cite web|url=https://www.smh.com.au/national/hospital-failed-to-diagnose-actress-20080415-gds9k0.html|title=Hospital 'failed' to diagnose actress|first=Natasha Wallace Health|last=Reporter|date=15 April 2008|website=The Sydney Morning Herald}}</ref>

=== New Zealand ===
A case was reported in 1989 in a 25-year-old man from New Zealand, who also received [[dura mater]] transplant.<ref name=ricketts/> Five New Zealanders have been confirmed to have died of the sporadic form of Creutzfeldt–Jakob disease (CJD) in 2012.<ref>{{cite web|url=https://www.stuff.co.nz/national/7962582/Mad-cow-link-in-hunters-death|title=Mad cow link in hunter's death|website=Stuff|date=16 November 2012}}</ref>

=== United States ===
In 1988, there was a confirmed death from CJD of a person from [[Manchester, New Hampshire]]. [[Massachusetts General Hospital]] believed the person acquired the disease from a surgical instrument at a [[podiatrist]]'s office.{{citation needed|date=November 2013}} In September 2013, another person in Manchester was posthumously determined to have died of the disease. The person had undergone brain surgery at [[Catholic Medical Center]] three months before his death, and a surgical probe used in the procedure was subsequently reused in other operations. Public health officials identified thirteen people at three hospitals who may have been exposed to the disease through the contaminated probe, but said the risk of anyone's contracting CJD is "extremely low."<ref>{{cite web|title=Autopsy confirms rare brain disease in NH patient|url=http://www.myfoxboston.com/story/23489308/2013/09/20/autopsy-confirms-rare-brain-disease-in-nh-patient|publisher=MyFoxBoston|access-date=20 September 2013|url-status=live|archive-url=https://web.archive.org/web/20130921055822/http://www.myfoxboston.com/story/23489308/2013/09/20/autopsy-confirms-rare-brain-disease-in-nh-patient|archive-date=21 September 2013|date=2013-09-20}}</ref><ref>{{cite web|title=NH Patient Likely Died of Rare Brain Disease|url=http://bigstory.ap.org/article/surgical-gear-quarantined-over-rare-brain-disease|publisher=AP|access-date=5 September 2013|url-status=live|archive-url=https://web.archive.org/web/20130908120727/http://bigstory.ap.org/article/surgical-gear-quarantined-over-rare-brain-disease|archive-date=8 September 2013}}</ref><ref name=globe>{{cite news|last=Kowalczyk |first=Liz |title=5 patients at Cape hospital at risk for rare brain disease |url=http://www.boston.com/news/local/massachusetts/2013/09/05/cape-cod-hospital-patients-possibly-exposed-brain-disease/CwGauqzFxf6Om8agTvUoAJ/story.html |work=Boston Globe |access-date=25 November 2013 |url-status=dead |archive-url=https://web.archive.org/web/20130909210818/http://www.boston.com/news/local/massachusetts/2013/09/05/cape-cod-hospital-patients-possibly-exposed-brain-disease/CwGauqzFxf6Om8agTvUoAJ/story.html |archive-date=9 September 2013 }}</ref> In January 2015, former speaker of the [[Utah House of Representatives]] [[Rebecca D. Lockhart]] died of the disease within a few weeks of diagnosis.<ref>{{cite web |url=http://www.heraldextra.com/news/local/central/provo/officials-lockhart-died-from-creutzfeldt-jakob-disease/article_ab2ba7d7-26b0-5e7a-8347-3142e5ded8cc.html |title=Officials: Lockhart, 'Utah's Iron Lady' died from Creutzfeldt-Jakob disease |access-date=2015-01-18 |url-status=live |archive-url=https://web.archive.org/web/20150120045509/http://www.heraldextra.com/news/local/central/provo/officials-lockhart-died-from-creutzfeldt-jakob-disease/article_ab2ba7d7-26b0-5e7a-8347-3142e5ded8cc.html |archive-date=2015-01-20 }}</ref> [[John Carroll (journalist)|John Carroll]], former editor of ''[[The Baltimore Sun]]'' and ''[[Los Angeles Times]]'', died of CJD in Kentucky in June 2015, after having been diagnosed in January.<ref>{{cite news|url=https://www.washingtonpost.com/national/john-s-carroll-edited-newspapers-in-baltimore-and-los-angeles-dies-at-73/2015/06/14/65bd5c1a-eac7-11e4-9a6a-c1ab95a0600b_story.html|title=John S. Carroll, acclaimed newspaper editor in Baltimore and L.A., dies at 73|last=Schudel|first=Matt|newspaper=The Washington Post|date=June 14, 2015|url-status=live|archive-url=https://web.archive.org/web/20160919122215/https://www.washingtonpost.com/national/john-s-carroll-edited-newspapers-in-baltimore-and-los-angeles-dies-at-73/2015/06/14/65bd5c1a-eac7-11e4-9a6a-c1ab95a0600b_story.html|archive-date=September 19, 2016}}</ref> American actress [[Barbara Tarbuck]] (''[[General Hospital]]'', ''[[American Horror Story]]'') died of the disease on December 26, 2016.<ref>{{cite web |url=https://variety.com/2016/tv/news/barbara-tarbuck-dead-dies-general-hospital-jane-jacks-ahs-1201950002/ |title=Barbara Tarbuck, 'General Hospital' and 'American Horror Story' Actress, Dies at 74 |access-date=2016-12-30 |url-status=live |archive-url=https://web.archive.org/web/20161230184246/http://variety.com/2016/tv/news/barbara-tarbuck-dead-dies-general-hospital-jane-jacks-ahs-1201950002/ |archive-date=2016-12-30 |date=2016-12-30 }}</ref> [[José Baselga]], clinical oncologist having headed the [[AstraZeneca]] Oncology division, died in [[Cerdanya]], March 21, 2021, from C-J Disease.{{citation needed|date=May 2021}}

== Research ==
=== Diagnosis ===
* In 2010, a team from New York described detection of PrP<sup>Sc</sup> in sheep's blood, even when initially present at only one part in one hundred billion (10<sup>−11</sup>) in sheep's brain tissue. The method combines amplification with a novel technology called [[surround optical fiber immunoassay]] (SOFIA) and some specific antibodies against PrP<sup>Sc</sup>. The technique allowed improved detection and testing time for PrP<sup>Sc</sup>.<ref>{{cite journal|date=August 2010|title=Detecting Prions in Blood|url=https://www.sgm.ac.uk/pubs/micro_today/pdf/081010.pdf|journal=Microbiology Today|pages=195|archive-url=https://web.archive.org/web/20120331021750/https://www.sgm.ac.uk/pubs/micro_today/pdf/081010.pdf|archive-date=31 March 2012|access-date=2011-08-21}}</ref><ref>{{cite journal | vauthors = Rubenstein R, Chang B, Gray P, Piltch M, Bulgin MS, Sorensen-Melson S, Miller MW | title = A novel method for preclinical detection of PrPSc in blood | journal = The Journal of General Virology | volume = 91 | issue = Pt 7 | pages = 1883–92 | date = July 2010 | pmid = 20357038 | doi = 10.1099/vir.0.020164-0 | doi-access = free }}</ref>
* In 2014, a human study showed a nasal brushing method that can accurately detect PrP in the olfactory epithelial cells of people with CJD.<ref>{{cite journal | vauthors = Orrú CD, Bongianni M, Tonoli G, Ferrari S, Hughson AG, Groveman BR, Fiorini M, Pocchiari M, Monaco S, Caughey B, Zanusso G | title = A test for Creutzfeldt-Jakob disease using nasal brushings | journal = The New England Journal of Medicine | volume = 371 | issue = 6 | pages = 519–29 | date = August 2014 | pmid = 25099576 | pmc = 4186748 | doi = 10.1056/NEJMoa1315200 }}</ref>

=== Treatment ===
* [[Pentosan polysulphate]] (PPS) was thought to slow the progression of the disease, and may have contributed to the longer than expected survival of the seven people studied.<ref>{{cite news |last=Bone |first=Ian |title=Intraventricular Pentosan Polysulphate in Human Prion Diseases: A study of Experience in the United Kingdom |publisher=Medical Research Council |date=12 July 2006 |url=https://www.bbc.co.uk/news/uk-northern-ireland-12667709 |access-date=2012-11-09 |url-status=live |archive-url=https://web.archive.org/web/20121103131854/http://www.bbc.co.uk/news/uk-northern-ireland-12667709 |archive-date=3 November 2012 }}</ref> The CJD Therapy Advisory Group to the UK Health Departments advises that data are not sufficient to support claims that pentosan polysulphate is an effective treatment and suggests that further research in animal models is appropriate.<ref>{{cite web |title=Use of Pentosan Polysulphate in the treatment of, or prevention of, vCJD |url=http://www.dh.gov.uk/en/Policyandguidance/Healthandsocialcaretopics/CJD/CJDgeneralinformation/DH_4031039 |publisher=Department of Health:CJD Therapy Advisory Group |access-date=2007-10-30 |url-status=live |archive-url=https://web.archive.org/web/20070705213245/http://www.dh.gov.uk/en/PolicyAndGuidance/HealthAndSocialCareTopics/CJD/CJDGeneralInformation/DH_4031039 |archive-date=2007-07-05 }}</ref> A 2007 review of the treatment of 26 people with PPS finds no proof of efficacy because of the lack of accepted objective criteria.<ref>{{cite journal | vauthors = Rainov NG, Tsuboi Y, Krolak-Salmon P, Vighetto A, Doh-Ura K | s2cid = 12725001 | title = Experimental treatments for human transmissible spongiform encephalopathies: is there a role for pentosan polysulfate? | journal = [[Expert Opinion on Biological Therapy]] | volume = 7 | issue = 5 | pages = 713–26 | date = May 2007 | pmid = 17477808 | doi = 10.1517/14712598.7.5.713 }}</ref>
* Use of [[RNA interference]] to slow the progression of [[scrapie]] has been studied in [[mice]]. The RNA blocks production of the protein that the CJD process transforms into prions. This research is unlikely to lead to a human therapy for many years.<ref>{{cite journal | vauthors = Pfeifer A, Eigenbrod S, Al-Khadra S, Hofmann A, Mitteregger G, Moser M, Bertsch U, Kretzschmar H | title = Lentivector-mediated RNAi efficiently suppresses prion protein and prolongs survival of scrapie-infected mice | journal = The Journal of Clinical Investigation | volume = 116 | issue = 12 | pages = 3204–10 | date = December 2006 | pmid = 17143329 | pmc = 1679709 | doi = 10.1172/JCI29236 | lay-url = http://news.bbc.co.uk/1/hi/health/6198072.stm | lay-date = 2006-12-04 | lay-source = BBC News }}</ref>
* Both [[amphotericin B]] and [[doxorubicin]] have been investigated as treatments for CJD, but as yet there is no strong evidence that either drug is effective in stopping the disease. Further study has been taken with other medical drugs, but none are effective. However, anticonvulsants and anxiolytic agents, such as [[valproate]] or a [[benzodiazepine]], may be administered to relieve associated symptoms.<ref name="Gambetti" />
* [[Quinacrine]], a medicine originally created for [[malaria]], has been evaluated as a treatment for CJD. The efficacy of quinacrine was assessed in a rigorous clinical trial in the UK and the results were published in Lancet Neurology,<ref>{{cite journal|author7-link=Martin Rossor | vauthors = Collinge J, Gorham M, Hudson F, Kennedy A, Keogh G, Pal S, Rossor M, Rudge P, Siddique D, Spyer M, Thomas D, Walker S, Webb T, Wroe S, Darbyshire J | title = Safety and efficacy of quinacrine in human prion disease (PRION-1 study): a patient-preference trial | journal = The Lancet. Neurology | volume = 8 | issue = 4 | pages = 334–44 | date = April 2009 | pmid = 19278902 | pmc = 2660392 | doi = 10.1016/S1474-4422(09)70049-3 }}</ref> and concluded that quinacrine had no measurable effect on the clinical course of CJD.
* [[Astemizole]], a medication approved for human use, has been found to have anti-prion activity and may lead to a treatment for Creutzfeldt–Jakob disease.<ref name="Karapetyan2013">{{cite journal | vauthors = Karapetyan YE, Sferrazza GF, Zhou M, Ottenberg G, Spicer T, Chase P, Fallahi M, Hodder P, Weissmann C, Lasmézas CI | title = Unique drug screening approach for prion diseases identifies tacrolimus and astemizole as antiprion agents | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 110 | issue = 17 | pages = 7044–9 | date = April 2013 | pmid = 23576755 | pmc = 3637718 | doi = 10.1073/pnas.1303510110 | bibcode = 2013PNAS..110.7044K | doi-access = free }}</ref>
* Use of [[Antisense oligonucleotide]]s to slow progression of CJD are being investigated and have shown promising activity in mice models.<ref>{{Cite web|url=https://www.news-medical.net/news/20190801/Prion-disease-in-mice-treated-successfully-with-antisense-oligonucleotides.aspx|title=Prion disease in mice treated successfully with antisense oligonucleotides|date=2019-08-01|website=News-Medical.net|language=en|access-date=2019-08-09}}</ref>

== See also ==
* [[Chronic traumatic encephalopathy]]
* [[Chronic wasting disease]]
* [[Kuru (disease)|Kuru]]

== References ==
{{Reflist}}

== External links ==
* {{Curlie|Health/Conditions_and_Diseases/Neurological_Disorders/Infections/Creutzfeldt_Jakob_Disease/}}
{{Medical resources
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{{Rối loạn tâm thần và hành vi }}

Phiên bản lúc 01:22, ngày 4 tháng 1 năm 2022

Creutzfeldt–Jakob disease
Tên khácClassic Creutzfeldt–Jakob disease[1]
Magnetic resonance image of sporadic CJD[2]
Phát âm
Khoa/NgànhNeurology
Triệu chứng
  • Early: memory problems, behavioral changes, poor coordination, visual disturbances[4]
  • Later: dementia, involuntary movements, blindness, weakness, coma[4]
Biến chứngAspiration pneumonia due to difficulty coughing
Khởi phátAround 60[4]
Diễn biến70% die within a year of diagnosis[4]
LoạiSporadic (mutation), Familial (heredity), Iatrogenic (acquired), Variant (Infection)[4]
Nguyên nhânPrion[4]
Yếu tố nguy cơHaving at least one living or deceased ancestor with the disease (in case of hereditary CJD)
Phương pháp chẩn đoánBased on symptoms and medical tests after other possible causes are ruled out[4]
Chẩn đoán phân biệtEncephalitis, chronic meningitis, Huntington's disease, Alzheimer's disease[4]
Điều trịSupportive care[4]
ThuốcFor pain relief: Morphine, Methadone
Tiên lượngUniversally fatal[4]
Dịch tễ1 per million per year[4]

Creutzfeldt–Jakob disease (CJD), also known as subacute spongiform encephalopathy or neurocognitive disorder due to prion disease, is a fatal degenerative brain disorder.[4][1] Early symptoms include memory problems, behavioral changes, poor coordination, and visual disturbances.[4] Later symptoms include dementia, involuntary movements, blindness, weakness, and coma.[4] About 70% of people die within a year of diagnosis.[4] The name Creutzfeldt–Jakob disease was introduced by Walther Spielmeyer in 1922, after the German neurologists Hans Gerhard Creutzfeldt and Alfons Maria Jakob.[5]

CJD is caused by a type of abnormal protein known as a prion.[6] Infectious prions are misfolded proteins that can cause normally folded proteins to also become misfolded.[4] About 85% of cases of CJD occur for unknown reasons, while about 7.5% of cases are inherited from a person's parents in an autosomal dominant manner.[4][7] Exposure to brain or spinal tissue from an infected person may also result in spread.[4] There is no evidence that sporadic CJD can spread among people via normal contact or blood transfusions,[4] although this is possible in variant Creutzfeldt–Jakob disease.[8][9] Diagnosis involves ruling out other potential causes.[4] An electroencephalogram, spinal tap, or magnetic resonance imaging may support the diagnosis.[4]

There is no specific treatment for CJD.[4] Opioids may be used to help with pain, while clonazepam or sodium valproate may help with involuntary movements.[4] CJD affects about one per million people per year.[4] Onset is typically around 60 years of age.[4] The condition was first described in 1920.[4] It is classified as a type of transmissible spongiform encephalopathy.[10] Inherited CJD accounts for about 10% of prion disease cases.[7] Sporadic CJD is different from bovine spongiform encephalopathy (mad cow disease) and variant Creutzfeldt–Jakob disease (vCJD).[11]

Signs and symptoms

The first symptom of CJD is usually rapidly progressive dementia, leading to memory loss, personality changes, and hallucinations. Myoclonus (jerky movements) typically occurs in 90% of cases, but may be absent at initial onset.[12] Other frequently occurring features include anxiety, depression, paranoia, obsessive-compulsive symptoms, and psychosis.[13] This is accompanied by physical problems such as speech impairment, balance and coordination dysfunction (ataxia), changes in gait, and rigid posture. In most people with CJD, these symptoms are accompanied by involuntary movements. The duration of the disease varies greatly, but sporadic (non-inherited) CJD can be fatal within months or even weeks.[14] Most victims die six months after initial symptoms appear, often of pneumonia due to impaired coughing reflexes. About 15% of people with CJD survive for two or more years.[15]

The symptoms of CJD are caused by the progressive death of the brain's nerve cells, which are associated with the build-up of abnormal prion proteins forming in the brain. When brain tissue from a person with CJD is examined under a microscope, many tiny holes can be seen where the nerve cells have died. Parts of the brain may resemble a sponge where the prions were infecting the areas of the brain.[16]

Cause

CJD is a type of transmissible spongiform encephalopathy (TSE), which are caused by prions.[6] Prions are misfolded proteins that occur in the neurons of the central nervous system (CNS). They are thought to affect signaling processes, damaging neurons and resulting in degeneration that causes the spongiform appearance in the affected brain.[17]

The CJD prion is dangerous because it promotes refolding of native prion protein into the diseased state.[18] The number of misfolded protein molecules will increase exponentially and the process leads to a large quantity of insoluble protein in affected cells. This mass of misfolded proteins disrupts neuronal cell function and causes cell death. Mutations in the gene for the prion protein can cause a misfolding of the dominantly alpha helical regions into beta pleated sheets. This change in conformation disables the ability of the protein to undergo digestion. Once the prion is transmitted, the defective proteins invade the brain and induce other prion protein molecules to misfold in a self-sustaining feedback loop. These neurodegenerative diseases are commonly called prion diseases.[19]

People can also develop CJD because they carry a mutation of the gene that codes for the prion protein (PRNP). This occurs in only 5–10% of all CJD cases. In sporadic cases, the misfolding of the prion protein is a process that is hypothesized to occur as a result of the effects of aging on cellular machinery, explaining why the disease often appears later in life.[4][20] An EU study determined that "87% of cases were sporadic, 8% genetic, 5% iatrogenic and less than 1% variant."[21]

Transmission

MRI of iCJD because of growth hormone

The defective protein can be transmitted by contaminated harvested human brain products, corneal grafts,[22] dural grafts,[23] or electrode[24] implants and human growth hormone.[25]

It can be familial (fCJD); or it may appear without clear risk factors (sporadic form: sCJD). In the familial form, a mutation has occurred in the gene for PrP, PRNP, in that family. All types of CJD are transmissible irrespective of how they occur in the person.[26]

It is thought that humans can contract the variant form of the disease by eating food from animals infected with bovine spongiform encephalopathy (BSE), the bovine form of TSE also known as mad cow disease. However, it can also cause sCJD in some cases.[27][28]

Cannibalism has also been implicated as a transmission mechanism for abnormal prions, causing the disease known as kuru, once found primarily among women and children of the Fore people in Papua New Guinea.[29] While the men of the tribe ate the muscle tissue of the deceased, women and children consumed other parts, such as the brain, and were more likely than men to contract kuru from infected tissue.[cần dẫn nguồn]

Prions, the infectious agent of CJD, may not be inactivated by means of routine surgical instrument sterilization procedures. The World Health Organization and the US Centers for Disease Control and Prevention recommend that instrumentation used in such cases be immediately destroyed after use; short of destruction, it is recommended that heat and chemical decontamination be used in combination to process instruments that come in contact with high-infectivity tissues. Thermal depolymerization also destroys prions in infected organic and inorganic matter, since the process chemically attacks protein at the molecular level, although more effective and practical methods involve destruction by combinations of detergents and enzymes similar to biological washing powders.[30]

Diagnosis

Testing for CJD has historically been problematic, due to nonspecific nature of early symptoms and difficulty in safely obtaining brain tissue for confirmation. The diagnosis may initially be suspected in a person with rapidly progressing dementia, particularly when they are also found with the characteristic medical signs and symptoms such as involuntary muscle jerking,[31] difficulty with coordination/balance and walking, and visual disturbances.[32] Further testing can support the diagnosis and may include:

  • Electroencephalography – may have characteristic generalized periodic sharp wave pattern. Periodic sharp wave complexes develop in half of the people with sporadic CJD, particularly in the later stages.[2]
  • Cerebrospinal fluid (CSF) analysis for elevated levels of 14-3-3 protein could be supportive in the diagnosis of sCJD. However, a positive result should not be regarded as sufficient for the diagnosis.[33][34][35] The Real-Time Quaking-Induced Conversion (RT-QuIC) assay has a diagnostic sensitivity of more than 80% and a specificity approaching 100%, tested in detecting PrPSc in CSF samples of people with CJD.[36][37][38] It is therefore suggested as a high-value diagnostic method for the disease.
  • MRI of the brain – often shows high signal intensity in the caudate nucleus and putamen bilaterally on T2-weighted images.

In recent years, studies have shown that the tumour marker Neuron-specific enolase (NSE) is often elevated in CJD cases; however, its diagnostic utility is seen primarily when combined with a test for the 14-3-3 protein.[39] Tính đến năm 2010, screening tests to identify infected asymptomatic individuals, such as blood donors, are not yet available, though methods have been proposed and evaluated.[40]

Imaging

Imaging of the brain may be performed during medical evaluation, both to rule out other causes and to obtain supportive evidence for diagnosis. Imaging findings are variable in their appearance, and also variable in sensitivity and specificity.[41] While imaging plays a lesser role in diagnosis of CJD,[42] characteristic findings on brain MRI in some cases may precede onset of clinical manifestations.[43]

Brain MRI is the most useful imaging modality for changes related to CJD. Of the MRI sequences, diffuse-weighted imaging sequences are most sensitive. Characteristic findings are as follows:

dwMRI, FDG PET and post mortem histology from a patient who presented with sCJD aged 66
  • Focal or diffuse diffusion-restriction involving the cerebral cortex and/or basal ganglia. In about 24% of cases DWI shows only cortical hyperintensity; in 68%, cortical and subcortical abnormalities; and in 5%, only subcortical anomalies.[44] The most iconic and striking cortical abnormality has been called "cortical ribboning" or "cortical ribbon sign" due to hyperintensities resembling ribbons appearing in the cortex on MRI.[45] The involvement of the thalamus can be found in sCJD, is even stronger and constant in vCJD.[46]
  • Varying degree of symmetric T2 hyperintense signal changes in the basal ganglia (i.e., caudate and putamen), and to a lesser extent globus pallidus and occipital cortex.[42]
  • Cerebellar atrophy

Brain FDG PET-CT tends to be markedly abnormal, and is increasingly used in the investigation of dementias.

  • Patients suffering from CJD will normally have hypometabolism on FDG PET.[47]

Histopathology

Spongiform change in CJD

Testing of tissue remains the most definitive way of confirming the diagnosis of CJD, although it must be recognized that even biopsy is not always conclusive.[cần dẫn nguồn]

In one-third of people with sporadic CJD, deposits of "prion protein (scrapie)," PrPSc, can be found in the skeletal muscle and/or the spleen.[cần dẫn nguồn] Diagnosis of vCJD can be supported by biopsy of the tonsils, which harbor significant amounts of PrPSc; however, biopsy of brain tissue is the definitive diagnostic test for all other forms of prion disease. Due to its invasiveness, biopsy will not be done if clinical suspicion is sufficiently high or low. A negative biopsy does not rule out CJD, since it may predominate in a specific part of the brain.[48]

The classic histologic appearance is spongiform change in the gray matter: the presence of many round vacuoles from one to 50 micrometers in the neuropil, in all six cortical layers in the cerebral cortex or with diffuse involvement of the cerebellar molecular layer.[49] These vacuoles appear glassy or eosinophilic and may coalesce. Neuronal loss and gliosis are also seen.[50] Plaques of amyloid-like material can be seen in the neocortex in some cases of CJD.[51]

However, extra-neuronal vacuolization can also be seen in other disease states. Diffuse cortical vacuolization occurs in Alzheimer's disease, and superficial cortical vacuolization occurs in ischemia and frontotemporal dementia. These vacuoles appear clear and punched-out. Larger vacuoles encircling neurons, vessels, and glia are a possible processing artifact.[48]

Classification

Types of CJD include:[52]

  • Sporadic (sCJD), caused by the spontaneous misfolding of prion-protein in an individual.[20] This accounts for 85% of cases of CJD.[53]
  • Familial (fCJD), caused by an inherited mutation in the prion-protein gene.[52] This accounts for the majority of the other 15% of cases of CJD.[53]
  • Acquired CJD, caused by contamination with tissue from an infected person, usually as the result of a medical procedure (iatrogenic CJD). Medical procedures that are associated with the spread of this form of CJD include blood transfusion from the infected person, use of human-derived pituitary growth hormones, gonadotropin hormone therapy, and corneal and meningeal transplants.[52][53][54] Variant Creutzfeldt–Jakob disease (vCJD) is a type of acquired CJD potentially acquired from bovine spongiform encephalopathy or caused by consuming food contaminated with prions.[52][55]
Clinical and pathologic characteristics[56]
Characteristic Classic CJD Variant CJD
Median age at death 68 years 28 years
Median duration of illness 4–5 months 13–14 months
Clinical signs and symptoms Dementia; early neurologic signs Prominent psychiatric/behavioral symptoms; painful dysesthesias; delayed neurologic signs
Periodic sharp waves on electroencephalogram Often present Often absent
Signal hyperintensity in the caudate nucleus and putamen on diffusion-weighted and FLAIR MRI Often present Often absent
Pulvinar sign-bilateral high signal intensities on axial FLAIR MRI. Also posterior thalamic involvement on sagittal T2 sequences Not reported Present in >75% of cases
Immunohistochemical analysis of brain tissue Variable accumulation. Marked accumulation of protease-resistant prion protein
Presence of agent in lymphoid tissue Not readily detected Readily detected
Increased glycoform ratio on immunoblot analysis of protease-resistant prion protein Not reported Marked accumulation of protease-resistant prion protein
Presence of amyloid plaques in brain tissue May be present May be present

Treatment

As of 2022, there is no cure or effective treatment for CJD.[57] Some of the symptoms like twitching can be managed, but otherwise treatment is palliative care.[57] Psychiatric symptoms like anxiety and depression can be treated with sedatives and antidepressants. Myoclonic jerks can be handled with clonazepam or sodium valproate. Opiates can help in pain.[58] Seizures are very uncommon but can nevertheless be treated with antiepileptic drugs.[59]

Prognosis

The condition is universally fatal. As of 1981, nobody is known to have lived longer than 2.5 years after the onset of CJD symptoms.[60]/ The longest recorded survivor of variant Creutzfeldt–Jakob disease (vCJD) was Jonathan Simms, a Northern Irish man who lived 10 years after his diagnosis.[61][62]

Epidemiology

CDC monitors the occurrence of CJD in the United States through periodic reviews of national mortality data. According to the CDC:[63][64]

  • CJD occurs worldwide at a rate of about 1 case per million population per year.
  • On the basis of mortality surveillance from 1979 to 1994, the annual incidence of CJD remained stable at approximately 1 case per million people in the United States.
  • In the United States, CJD deaths among people younger than 30 years of age are extremely rare (fewer than five deaths per billion per year).
  • The disease is found most frequently in people 55–65 years of age, but cases can occur in people older than 90 years and younger than 55 years of age.
  • In more than 85% of cases, the duration of CJD is less than 1 year (median: four months) after the onset of symptoms.

Further information from the CDC:[65]

  • Risk of developing CJD increases with age.
  • CJD incidence was 3.5 cases per million among those over 50 years of age between 1979 and 2017.
  • Approximately 85% of CJD cases are sporadic and 10-15% of CJD cases are due to inherited mutations of the prion protein gene.
  • CJD deaths and age-adjusted death rate in the United States indicate an increasing trend in the number of deaths between 1979 and 2017.

Although not fully understood, additional information suggests that CJD rates in African American and nonwhite groups are lower than in whites. While the mean onset is approximately 67 years of age, cases of sCJD have been reported as young as 17 years and over 80 years of age. Mental capabilities rapidly deteriorate and the average amount of time from onset of symptoms to death is 7 to 9 months.[66]

According to a 2020 systematic review on the international epidemiology of CJD:[67]

  • Surveillance studies from 2005 and newer show the estimated global incidence is 1–2 cases per million population per year.
  • Sporadic CJD (sCJD) incidence increased from the years 1990–2018 in the UK.
  • Probable or definite sCJD deaths also increased from the years 1996–2018 in twelve additional countries.
  • CJD incidence is greatest in those over the age of 55 years old, with an average age of 67 years old.

The intensity of CJD surveillance increases the number of reported cases, often in countries where CJD epidemics have occurred in the past and where surveillance resources are greatest.[67] An increase in surveillance and reporting of CJD is most likely in response to BSE and vCJD.[66] Possible factors attributing to an increase of CJD incidence are due to an aging population, population increase, clinician awareness, and more accurate diagnosis methods. Since CJD symptoms are similar to other neurological conditions, it is also possible that CJD is mistaken for stroke, acute nephropathy, general dementia, and hyperparathyroidism.[67]

History

The disease was first described by German neurologists Hans Gerhard Creutzfeldt in 1920 and shortly afterward by Alfons Maria Jakob, giving it the name Creutzfeldt–Jakob. Some of the clinical findings described in their first papers do not match current criteria for Creutzfeldt–Jakob disease, and it has been speculated that at least two of the people in initial studies were suffering from a different ailment.[68] An early description of familial CJD stems from the German psychiatrist and neurologist Friedrich Meggendorfer (1880–1953).[69][70] A study published in 1997 counted more than 100 cases worldwide of transmissible CJD and new cases continued to appear at the time.[71]

The first report of suspected iatrogenic CJD was published in 1974. Animal experiments showed that corneas of infected animals could transmit CJD, and the causative agent spreads along visual pathways. A second case of CJD associated with a corneal transplant was reported without details. In 1977, CJD transmission caused by silver electrodes previously used in the brain of a person with CJD was first reported. Transmission occurred despite the decontamination of the electrodes with ethanol and formaldehyde. Retrospective studies identified four other cases likely of similar cause. The rate of transmission from a single contaminated instrument is unknown, although it is not 100%. In some cases, the exposure occurred weeks after the instruments were used on a person with CJD.[71] In the 1980s it was discovered that Lyodura, a dura mater transplant product was shown to transmit Creutzfeldt–Jakob disease from the donor to the recipient. This led to the product being banned in Canada but it was used in other countries such as Japan until 1993.[72]

A review article published in 1979 indicated that 25 dura mater cases had occurred by that date in Australia, Canada, Germany, Italy, Japan, New Zealand, Spain, the United Kingdom, and the United States.[71]

By 1985, a series of case reports in the United States showed that when injected, cadaver-extracted pituitary human growth hormone could transmit CJD to humans.[71]

In 1992, it was recognized that human gonadotropin administered by injection could also transmit CJD from person to person.[71]

Stanley B. Prusiner of the University of California, San Francisco (UCSF) was awarded the Nobel Prize in Physiology or Medicine in 1997 "for his discovery of Prions—a new biological principle of infection".[73] However, Yale University neuropathologist Laura Manuelidis has challenged the prion protein (PrP) explanation for the disease. In January 2007, she and her colleagues reported that they had found a virus-like particle in naturally and experimentally infected animals. "The high infectivity of comparable, isolated virus-like particles that show no intrinsic PrP by antibody labeling, combined with their loss of infectivity when nucleic acid–protein complexes are disrupted, make it likely that these 25-nm particles are the causal TSE virions".[74]

Australia

Australia has documented 10 cases of healthcare-acquired CJD (iatrogenic or ICJD). Five of the deaths resulted after the patients, who were in treatment either for infertility or short stature, were treated using contaminated pituitary extract hormone but no new cases have been noted since 1991. The other five deaths occurred due to dura grafting procedures that were performed during brain surgery, in which the covering of the brain is repaired. There have been no other ICJD deaths documented in Australia due to transmission during healthcare procedures.[75]

However, Carol Willesee, the ex-wife of Australian reporter Mike Willesee, died of the sporadic form of the disease in December 2006.[75][76]

New Zealand

A case was reported in 1989 in a 25-year-old man from New Zealand, who also received dura mater transplant.[71] Five New Zealanders have been confirmed to have died of the sporadic form of Creutzfeldt–Jakob disease (CJD) in 2012.[77]

United States

In 1988, there was a confirmed death from CJD of a person from Manchester, New Hampshire. Massachusetts General Hospital believed the person acquired the disease from a surgical instrument at a podiatrist's office.[cần dẫn nguồn] In September 2013, another person in Manchester was posthumously determined to have died of the disease. The person had undergone brain surgery at Catholic Medical Center three months before his death, and a surgical probe used in the procedure was subsequently reused in other operations. Public health officials identified thirteen people at three hospitals who may have been exposed to the disease through the contaminated probe, but said the risk of anyone's contracting CJD is "extremely low."[78][79][80] In January 2015, former speaker of the Utah House of Representatives Rebecca D. Lockhart died of the disease within a few weeks of diagnosis.[81] John Carroll, former editor of The Baltimore Sun and Los Angeles Times, died of CJD in Kentucky in June 2015, after having been diagnosed in January.[82] American actress Barbara Tarbuck (General Hospital, American Horror Story) died of the disease on December 26, 2016.[83] José Baselga, clinical oncologist having headed the AstraZeneca Oncology division, died in Cerdanya, March 21, 2021, from C-J Disease.[cần dẫn nguồn]

Research

Diagnosis

  • In 2010, a team from New York described detection of PrPSc in sheep's blood, even when initially present at only one part in one hundred billion (10−11) in sheep's brain tissue. The method combines amplification with a novel technology called surround optical fiber immunoassay (SOFIA) and some specific antibodies against PrPSc. The technique allowed improved detection and testing time for PrPSc.[84][85]
  • In 2014, a human study showed a nasal brushing method that can accurately detect PrP in the olfactory epithelial cells of people with CJD.[86]

Treatment

  • Pentosan polysulphate (PPS) was thought to slow the progression of the disease, and may have contributed to the longer than expected survival of the seven people studied.[87] The CJD Therapy Advisory Group to the UK Health Departments advises that data are not sufficient to support claims that pentosan polysulphate is an effective treatment and suggests that further research in animal models is appropriate.[88] A 2007 review of the treatment of 26 people with PPS finds no proof of efficacy because of the lack of accepted objective criteria.[89]
  • Use of RNA interference to slow the progression of scrapie has been studied in mice. The RNA blocks production of the protein that the CJD process transforms into prions. This research is unlikely to lead to a human therapy for many years.[90]
  • Both amphotericin B and doxorubicin have been investigated as treatments for CJD, but as yet there is no strong evidence that either drug is effective in stopping the disease. Further study has been taken with other medical drugs, but none are effective. However, anticonvulsants and anxiolytic agents, such as valproate or a benzodiazepine, may be administered to relieve associated symptoms.[15]
  • Quinacrine, a medicine originally created for malaria, has been evaluated as a treatment for CJD. The efficacy of quinacrine was assessed in a rigorous clinical trial in the UK and the results were published in Lancet Neurology,[91] and concluded that quinacrine had no measurable effect on the clinical course of CJD.
  • Astemizole, a medication approved for human use, has been found to have anti-prion activity and may lead to a treatment for Creutzfeldt–Jakob disease.[92]
  • Use of Antisense oligonucleotides to slow progression of CJD are being investigated and have shown promising activity in mice models.[93]

See also

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