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===No clear evidence that ME/CFS is contagious=== [[:Category:Infectious agents|Infectious episodes]] have led to [[List of myalgic encephalomyelitis and chronic fatigue syndrome outbreaks|outbreaks]] over the years and 72% of ME/CFS patients report an [[Onset of ME/CFS|onset]] of a viral or bacterial infection.<ref>{{Cite web|url=https://www.cdc.gov/grand-rounds/pp/2016/20160216-presentation-chronic-fatigue-H.pdf | title = CDC Public Health Grand Rounds - Chronic Fatigue Syndrome - Advancing Research and Clinical Education | last = | first = | authorlink = | date = |website=CDC | page = 6|archive-url=|archive-date=|access-date=}}</ref> Nowadays, the vast majority of ME/CFS cases are sporadic rather than epidemic, and although some outbreaks have been caused by known viruses - such as the [[2003 Hong Kong outbreak|SARS pandemic]] and [[2019 Coronavirus pandemic outbreak|COVID-19]] - there is no clear evidence that sporadic ME/CFS cases are contagious.<ref name="pediatricprimer">{{Cite journal | last = Rowe | first = Katherine S. | last2 = Vallings | first2 = Rosamund | last3 = Stewart | first3 = Julian M. | last4 = Speight | first4 = Nigel | last5 = Schwartz | first5 = Malcolm S. | last6 = Medow | first6 = Marvin S. | last7 = Gurwitt | first7 = Alan | last8 = Friedman | first8 = Kenneth J. | last9 = Underhill | first9 = Rosemary A. | date = 2017 | title=Myalgic Encephalomyelitis/Chronic Fatigue Syndrome Diagnosis and Management in Young People: A Primer |url = https://www.frontiersin.org/articles/10.3389/fped.2017.00121/full|journal=Frontiers in Pediatrics|language=English|volume=5|doi=10.3389/fped.2017.00121|issn=2296-2360}}</ref> Families, partners, and friends do not report contracting ME/CFS from someone with the disease nor do patients report passing it on to others.<ref>{{Cite web|url=http://forums.prohealth.com/forums/index.php?threads/is-cfs-contagious.189664/ | title = Is CFS contagious? {{!}} ProHealth Fibromyalgia, ME/CFS and Lyme Disease Forums|website=forums.prohealth.com|access-date=2019-02-13}}</ref> However, Underhill and O'Gorman (2006) researched 219 patients with ME/CFS, and concluded that close household contact and genetics were both risk factors for CFS, finding 3.2% of spouses/partners of those with CFS also had the illness.<ref name="UnderhillInfectious">{{Cite journal | last = Underhill | first = Rosemary A. | last2 = O'Gorman | first2 = Ruth | date = 2006-01-01 | title = Prevalence of Chronic Fatigue Syndrome and Chronic Fatigue Within Families of CFS Patients|url=https://doi.org/10.1300/J092v13n01_02|journal=Journal of Chronic Fatigue Syndrome|volume=13|issue=1|pages=3β13|doi=10.1300/J092v13n01_02|issn=1057-3321}}</ref> This was a higher prevalence than all genetic relatives except children of patients. Because ME/CFS can run in families, a [[Genetics of chronic fatigue syndrome|genetic link]] is a line of research recommended by the CDC.<ref>{{Cite web|url=https://www.cdc.gov/me-cfs/about/possible-causes.html | title = Possible Causes {{!}} Myalgic Encephalomyelitis/Chronic Fatigue Syndrome | date = 2019-01-18 | website = [[Centers for Disease Control and Prevention]]|language=en-us|access-date=2019-02-13}}</ref><br /> [[Michael Sikora]] and collaborators at the [[Open Medicine Foundation]] hope that their research on the role of [[T cell]]s and immune-related [[Genetics of chronic fatigue syndrome|genes]] will help address "whether ME/CFS is an autoimmune or infectious disease, or simply an activation of the immune system".<ref name="omf-funded">{{Cite web|url=https://www.omf.ngo/2018/06/04/omf-funded-research/ | title = OMF funded research | date = Jun 4, 2018 | website = [[Open Medicine Foundation]]}}</ref> ====Blood donation and organ transplant==== Patients with ME/CFS are banned from [[Blood donation|donating blood]] or tissues in the [[United Kingdom|UK]] by the UK's [[National Health Service]], including patients who have recovered.<ref name="Blood">{{Cite web|url=https://my.blood.co.uk/knowledgebase/Index/C | title = My Donor Record - Health, Eligibility & Travel|website=my.blood.co.uk|access-date=2021-04-01}}</ref><ref>{{Cite web|url=https://transfusionguidelines.org.uk/ | title = Joint United Kingdom (UK) Blood Transfusion and Tissue Transplantation Services Professional Advisory Committee - Transfusion Guidelines | last = Target Information Systems Ltd|website=transfusionguidelines.org.uk|language=en|access-date=2021-04-01}}</ref> In the [[United States]] a temporary ban on donations from ME/CFS patients was put in place due to the research of [[Xenotropic murine leukemia virus-related virus|XMRV]] as being the infectious trigger of CFS<ref name="PostRedCross2010" /><ref>{{Cite web|url=https://www.meassociation.org.uk/2010/04/xmrv-testing-in-the-uk/ | title = XMRV testing in the UK | last = | first = | authorlink = | date = 2010 | website = ME Association|language=en-US|archive-url=|archive-date=|access-date=2019-02-13}}</ref> and that patients carried the virus.<ref name="PostRedCross2010">{{Cite news | url=http://voices.washingtonpost.com/checkup/2010/12/red_cross_bars_chronic_fatique.html | title = Red Cross bars chronic fatigue patients from donating blood | last = Stein | first = Rob | authorlink = | date = Dec 3, 2010|publisher=Washington Post|archive-url=|archive-date=|access-date=}}</ref> Two papers on XMRV were retracted as it was a laboratory contamination.<ref name="Redaction2012">{{Cite journal | date = Dec 2012 | title = Redaction, retraction and reaction|url=https://www.nature.com/articles/nrmicro2928|journal=Nature Reviews Microbiology|language=en|volume=10|issue=12 | pages = 799|doi=10.1038/nrmicro2928|issn=1740-1534}}</ref><ref name="TN2012">{{Cite web|url=https://transfusionnews.com/2012/10/05/multicenter-study-finds-no-correlation-between-chronic-fatigue-syndrome-and-xmrv/ | title = Multicenter Study Finds No Correlation between Chronic Fatigue Syndrome and XMRV|website=transfusionnews.com|access-date=2019-02-13}}</ref> Currently the US American Red Cross no longer have statements barring transfusions or transplants from ME/CFS patients, but patients are expected to be in "good health" which would exclude most.<ref name="RedCross">{{Cite web|url=https://www.redcrossblood.org/faq.html#eligibility-health|access-date=2019-02-13 | title = Frequently Asked Questions | date = | last = | first = | authorlink = |archive-url=|archive-date=|website=American Red Cross|quote=Your search for "Chronic fatigue syndrome" returned no results.}}</ref> Patient charities discouraged ME/CFS patients from donating blood,<ref name="MassBlood2015">{{Cite web |url=https://www.massmecfs.org/research/recent-research/19-xmrv/237-aabbs-recommendation-on-cfidsme-and-blood-donation | title = AABB's recommendation on ME/CFS and blood donation | date = Nov 25, 2015 |website=[[Massachusetts ME/CFS & FM Association]]}}</ref> but the American Association of Blood Banks advises to either accept or defer donors based on "clinical judgment of the donor's health status".<ref name="AABBOct2012">{{Cite web | last = American Association of Blood Banks | url=https://www.aabb.org/docs/default-source/default-document-library/regulatory/eid/xmrvfactsheet.pdf?sfvrsn=cd162fa3_2 | date = October 2012 | title = Xenotropic Murine Leukemia Virus-Related Virus (XMRV) and other Polytropic Murine Leukemia Viruses (pMLV) |pages = 3 |quote=An updated AABB Association Bulletin #12-05 (November 2012) states that individual collectors of blood and cellular therapy products should accept or defer donors with a history of CFS based on their clinical judgment of the donor's health status.}}</ref> [[New Zealand]] bans blood donation from anyone with ME/CFS.<ref name="NZBlood">{{Cite web |url = https://www.nzblood.co.nz/become-a-donor/am-i-eligible/detailed-eligibility-criteria/ | title = Detailed Eligibility Criteria|access-date=2022-05-25 | date = |website=NZ Blood|quote=People with a diagnosis of Chronic Fatigue Syndrome are permanently ineligible from donating blood in New Zealand}}</ref> [[Australia]] has a prohibition on blood donation as a precaution because it has not been established if ME/CFS could be caused by a transmissible infection.<ref name="AusBloodDonation">https://www.lifeblood.com.au/faq/eligibility/medical-conditions-and-procedures/chronic-fatigue-syndrome</ref>
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