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==Epidemiology == In the [[United States]], 836,000 - 2.5 million people suffer from ME/CFS. "The total economic costs of ME/CFS are estimated at $17 to $24 billion annually."<ref name="guide" /> Some CFS patients can work with [https://www.dol.gov/general/topic/disability/jobaccommodations job accommodations] but between 1 in 3 and 1 in 2 patients become unable to work and [[Disability|many rely on SSDI/SSI]].<ref>[http://phoenixrising.me/living-i-the-basics/disability-chronic-fatigue-syndrome-mecfs Disability for CFS - Phoenix Rising]</ref><ref>[http://www.womenshealth.gov/publications/our-publications/fact-sheet/chronic-fatigue-syndrome.html CFS - Womenshealth.gov]</ref><ref>[https://www.masscfids.org/job-accommodations Job Accommodations - MASS CFIDS]</ref> *[[Epidemiology of myalgic encephalomyelitis and chronic fatigue syndrome|Epidemiology]] :All races and cultures are afflicted with ME/CFS.<ref>[http://bmcmedicine.biomedcentral.com/articles/10.1186/1741-7015-9-91 Prevalence of myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) in three regions of England: a repeated cross-sectional study in primary care - Bio-Med Central - July 2011]</ref><ref name="epidemiology">{{Cite web | title = Epidemiology {{!}} Presentation and Clinical Course {{!}} Healthcare Providers {{!}} Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS)|url=https://www.cdc.gov/me-cfs/healthcare-providers/presentation-clinical-course/epidemiology.html|website=[[Centers for Disease Control and Prevention]] | date = 2018-11-08|access-date=2019-01-29|language=en-us}}</ref> Children and adolescents are also diagnosed.<ref>{{Cite web | title = ME/CFS in Children {{!}} Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS)|url=https://www.cdc.gov/me-cfs/me-cfs-children/index.html|website=[[Centers for Disease Control and Prevention]] | date = 2019-01-18|access-date=2019-01-29|language=en-us}}</ref><ref>{{Cite web | title = Pediatric ME/CFS Home Page|url=https://www.massmecfs.org/pediatric-me-cfs-home-page|website=massmecfs.org|access-date=2019-01-29}}</ref> *[[Female predominant diseases]] :Like many [[Autoimmune disease|autoimmune]] and [[Neuro-immune disease|neuro-immune]] diseases where mostly women are afflicted,<ref>[http://www.rightdiagnosis.com/artic/fact_sheet_autoimmune_disease_in_women_nwhic.htm Fact Sheet Autoimmune Disease in Women: NWHIC - Right Diagnosis - Aug 2015]</ref> the ME/CFS female/male patient ratio per Capelli et al. is 6:1<ref>{{Cite journal | title = Chronic fatigue syndrome/myalgic encephalomyelitis: an update|url=https://www.ncbi.nlm.nih.gov/pubmed/21244747|journal=International Journal of Immunopathology and Pharmacology | date = Oct 2010|issn=0394-6320|pmid=21244747 | pages = 981β989|volume=23|issue=4|doi=10.1177/039463201002300402 | first = E. | last=Capelli | first2 = R. | last2 = Zola | first3 = L. | last3 = Lorusso | first4 = L. | last4 = Venturini | first5 = F. | last5 = Sardi | first6 = G. | last6 = Ricevuti}}</ref> while the CDC states 4:1.<ref name="epidemiology"/> *[[Pediatric myalgic encephalomyelitis and chronic fatigue syndrome|Pediatric]] :Pediatric ME/CFS is defined by the CDC<ref>{{Cite web|url=https://www.cdc.gov/me-cfs/me-cfs-children/factsheet-healthcare-professional.html | title = Pediatric ME/CFS: Fact Sheet for Healthcare Professionals {{!}} Myalgic Encephalomyelitis/Chronic Fatigue Syndrome | date = 2017-10-10 | website = [[Centers for Disease Control and Prevention]]|language=en-us|access-date=2018-10-13}}</ref> and the [[National Academy of Medicine]] (NAM)<ref name="IOM2015-Ch6">{{Cite book | last = Institute of Medicine | first = | date = 2015-03-16 | title = Beyond Myalgic Encephalomyelitis/Chronic Fatigue Syndrome|url=https://www.nap.edu/read/19012/chapter/8|publisher=The National Academies Press|language=en|chapter=Pediatric ME/CFS Chapter 6 | page = 181|doi=10.17226/19012|quote=}}</ref> although it is usually diagnosed in adults.<ref name="whatis"/> "Children below the age of 8 or 9 do not have the symptom pattern of adolescents past puberty. If the onset of the disease occurs during adolescence, the most common time of onset, the pattern is similar to that of adults."<ref>{{Cite news | url=https://www.omf.ngo/2016/06/25/mecfs-in-children-by-dr-david-s-bell-2/ | title = ME/CFS in Children - by David S. Bell, MD|website = Open Medicine Foundation | date = 2016-06-25|access-date=2018-08-11|language=en-US}}</ref> The prognosis in adolescents is considered to be better than in adults.<ref name="prognosis">{{Cite web|url=https://www.cdc.gov/me-cfs/healthcare-providers/presentation-clinical-course/prognosis.html | title = Prognosis {{!}} Presentation and Clinical Course {{!}} Healthcare Providers {{!}} Myalgic Encephalomyelitis/Chronic Fatigue Syndrome | date = 2018-07-10 | website = [[Centers for Disease Control and Prevention]]|language=en-us|access-date=2018-10-28}}</ref><ref name="pediatricprimer"/> Children are diagnosed with ME/CFS at three months of illness under SEID and CCC and ME is diagnosed immediately under ICC.<ref>{{Cite web|url=https://www.masscfids.org/pediatric-me-cfs-links | title = Pediatric ME/CFS links|website=[[Massachusetts ME/CFS & FM Association]]|language=en-GB|access-date=2018-08-11}}</ref><ref name="guide" /><ref name="Carruthers, 2003" /><ref name="ICC" /> *[[Prevalence of myalgic encephalomyelitis and chronic fatigue syndrome|Prevalence]] :"Worldwide, there may be as many as 17 β 24 million people with ME/CFS."<ref>{{Cite web|url=https://ammes.org/how-many-people-have-mecfs/ | title = How Many People Have ME/CFS? β American ME and CFS Society|language=en-US|access-date=2019-01-31}}</ref> 25% of ME/CFS patients are [[Severe and very severe ME|housebound or bedbound]] at some point in their illness.<ref name="facts">{{Cite web|url=https://www.nap.edu/resource/19012/MECFS_KeyFacts.pdf | title = Myalgic Encelphalomyelitis/Chronic Fatigue Syndrome (ME/CFS) Key Facts | last = | first = | authorlink = | date = 2015 | website = nationalacademies.org|archive-url=|archive-date=|access-date=}}</ref><ref name="IOM2015MECFS">{{Cite book | last = Institute of Medicine | authorlink = Institute of Medicine | title = Beyond Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: Redefining an Illness|location=Washington, DC|publisher=The National Academies Press | date = 2015 | url=https://www.ncbi.nlm.nih.gov/books/NBK284902/|isbn=0309316898 | pmid = 25695122|doi = 10.17226/19012 }}</ref>{{Rp|32}} and 90% of people with ME/CFS are undiagnosed.<ref name="whatis"/> *[[Prognosis for myalgic encephalomyelitis and chronic fatigue syndrome|Prognosis]] :The prognosis for a patient diagnosed with ME/CFS isconsidered to be poor with only a minority (a median estimate of 5%) returning to pre-morbid levels of functioning.<ref name="Cairns2005">{{Cite journal | last = Cairns | first = R. | last2 = Hotopf | first2 = M. | date = Jan 2005 | title = A systematic review describing the prognosis of chronic fatigue syndrome|url=https://www.ncbi.nlm.nih.gov/pubmed/15699087|journal=Occupational Medicine (Oxford, England)|volume=55|issue=1|pages=20β31|doi=10.1093/occmed/kqi013|issn=0962-7480|pmid=15699087}}</ref> The majority of patients remains significantly impaired. A substantial improvement however is noted in an estimated 40% of patients.<ref name="Cairns2005" /><ref>{{Cite journal | last= Joyce | first = J. | last2 = Hotopf | first2 = M. | last3 = Wessely | first3 = S. | date = Mar 1997 | title = The prognosis of chronic fatigue and chronic fatigue syndrome: a systematic review | url =https://www.ncbi.nlm.nih.gov/pubmed/9093600|journal=QJM: monthly journal of the Association of Physicians|volume=90|issue=3|pages=223β233|issn=1460-2725|pmid=9093600}}</ref>
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