Historical Background and Epidemics
1 Gilliam 1938 — Los Angeles County Hospital Outbreak (First ME/CFS Epidemic)
Full Citation:: Gilliam AG. Epidemiological Study of an Epidemic, Diagnosed as Poliomyelitis, Occurring among the Personnel of the Los Angeles County General Hospital during the Summer of 1934. USPHS Public Health Bulletin. 1938;(240). Significance:: First documented ME/CFS outbreak. 198 staff affected with poliomyelitis-like symptoms but negative polio testing. Female predominance, prolonged convalescence (weeks to months), neurological involvement. Described as “atypical poliomyelitis.” Landmark primary source establishing the outbreak pattern. Certainty Score: 0.40 (primary source; historical value high; small by modern standards; USPHS bulletin)
2 Acheson 1959 — Synthesis of 14 ME Epidemics
Full Citation:: Acheson ED. The Clinical Syndrome Variously Called Benign Myalgic Encephalomyelitis, Iceland Disease and Epidemic Neuromyasthenia. American Journal of Medicine. 1959;26(4):569–595. DOI:: 10.1016/0002-9343(59)90280-3 PMID:: 13637100 Key Findings::
- Synthesised 14 epidemics worldwide (1934--1958): Los Angeles 1934, Akureyri 1948-49, Adelaide 1949, New York State 1950, Middlesex 1952, Coventry 1953, Rockville 1953, Royal Free 1955, Durban 1955, Segbwema 1956, Punta Gorda 1956, Gilfac 1956, Northwest London 1957, Athens 1958
- Coined "benign myalgic encephalomyelitis"
- All outbreaks showed female predominance, prolonged recovery, neurological involvement, negative polio testingCertainty Score: 0.55
3 Sigurdsson et al. 1950 — Akureyri Disease
Full Citation:: Sigurdsson B, Sigurjónsson J, Sigurdsson JH, Thorkelsson J, Gudmundsson KR. A Disease Epidemic in Iceland Simulating Poliomyelitis. American Journal of Hygiene. 1950;52(2):222–238. DOI:: 10.1093/oxfordjournals.aje.a119549 Significance:: Original description of the 1948-49 Akureyri outbreak affecting 1,106 people. Coined “Iceland disease.” Detailed epidemiological description of post-epidemic cluster with neurologic symptoms + profound fatigue.
4 Royal Free Hospital Medical Staff 1957 — London Epidemic
Full Citation:: Medical Staff of the Royal Free Hospital. An Outbreak of Encephalomyelitis in the Royal Free Hospital Group, London, in 1955. British Medical Journal. 1957;2(5050):895–904. DOI:: 10.1136/bmj.2.5050.895 PMCID:: PMC1962472 Key Findings:: Primary source hospital report. 292 staff affected over 4 months. Severe muscle pain, paresis, sensory disturbances, emotional lability, prolonged convalescence. Origin of the term “myalgic encephalomyelitis.”
5 McEvedy & Beard 1970 — Royal Free Mass Hysteria Hypothesis
Full Citation:: McEvedy CP, Beard AW. Royal Free Epidemic of 1955: A Reconsideration. British Medical Journal. 1970;1(5687):7–11. DOI:: 10.1136/bmj.1.5687.7 PMID:: 5411596 Key Findings:: Proposed that Royal Free outbreak was “epidemic hysteria.” Argument based on female predominance, absence of mortality, negative lab findings. Subsequently refuted but established psychosomatic framing for decades. Certainty Score: 0.25
6 Ramsay 1986 — Royal Free Disease Rebuttal
Full Citation:: Ramsay AM. Myalgic Encephalomyelitis and Postviral Fatigue States: The Saga of Royal Free Disease. 2nd ed. London: Gower Medical Publishing; 1986. ISBN:: 0906923999 Key Findings:: Definitive rebuttal of McEvedy’s hysteria hypothesis. Author was physician at Royal Free during 1955 outbreak. Long-term follow-up showed organic sequelae.
7 Clayton 2015 — IOM Report Summary
Full Citation:: Clayton EW. Beyond Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: An IOM Report on Redefining an Illness. JAMA. 2015;313(11):1101–1102. DOI:: 10.1001/jama.2015.1346 PMID:: 25668027 Key Findings::
- Summary of IOM 2015 report by committee chair
- Reaffirms ME/CFS as biological, not psychological
- Proposes SEID diagnostic criteria
- Estimates 836,000--2.5 million Americans affected; economic cost $17--24 billion annuallyCertainty Score: 0.80
8 Komaroff 2015 — Biological Illness Recognition
Full Citation:: Komaroff AL. Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: A Real Illness. Annals of Internal Medicine. 2015;162(12):871–872. DOI:: 10.7326/M15-0647 PMID:: 26075755 Key Findings:: Editorial declaring ME/CFS is “clearly a biological illness, not a psychosomatic disorder.” Reviews immune dysfunction, impaired NK function, neuroendocrine abnormalities, brain imaging findings, metabolic changes. Marks institutional shift.
Full Citation:: Underhill RA. Myalgic encephalomyelitis, chronic fatigue syndrome: An infectious disease. Medical Hypotheses. 2015;85(6):765–773. DOI:: 10.1016/j.mehy.2015.10.011 Topics:: Historical outbreaks from 1934 onwards.
Full Citation:: Underhill RA, O’Gorman R. The viral origin of myalgic encephalomyelitis/chronic fatigue syndrome. Journal of the Royal Society of Medicine. 2023;116(8):269–282. DOI:: 10.1177/01410768231176937 PMCID:: PMC10434940
Full Citation:: Brurberg KG, Fønhus MS, Larun L, Flottorp S, Malterud K. Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: Organic Disease or Psychosomatic Illness? A Re-Examination of the Royal Free Epidemic of 1955. Medicina. 2021;57(1):12. DOI:: 10.3390/medicina57010012 PMID:: 33375343 Key Findings:: First-hand accounts confirm organic infectious disease, not hysteria.