Analysis of Centers for Disease Control and Prevention criteria for the eosinophilia-myalgia syndrome in a geographically defined population.
OBJECTIVE
To test whether individuals can be identified in a geographically defined population who would meet criteria for the eosinophilia-myalgia syndrome (EMS) established by the US Centers for Disease Control and Prevention (CDC), i.e, (1) eosinophil count > 1 x 10(9)/l, (2) myalgia severe enough to limit usual activities of daily living, and (3) no evidence of infection or neoplasm that could explain the first 2 findings.


METHODS
To discover the number of individuals who would meet CDC criteria, the population was exhaustively searched using methods adapted from active pharmacoepidemiologic surveillance. Medical consultants and primary care practitioners were questioned as many as 5 times in a search for patients with severe myalgia. A predetermined protocol was used to screen those patients who appeared to meet CDC criteria for EMS using active surveillance methods. The study population was limited to Québec and Ontario (combined population 18,980,000) with special attention to the period July 1, 1992, to June 30, 1993.


RESULTS
The prevalence of severe incapacitating myalgia was 43 per 100,000 persons, including 19 individuals with eosinophilia > 1 x 10(9)/l, who met CDC criteria for EMS. None of these individuals were reported to have taken L-tryptophan (LT).


CONCLUSIONS
The CDC criteria for EMS are met by individuals in the general population who have never been exposed to LT.
Department of Epidemiology and Biostatistics, McGill University, Montreal, Canada.
W O
WO
Spitzer
J L
JL
Haggerty
L
L
Berkson
W
W
Davis
W
W
Palmer
R
R
Tamblyn
R
R
Laprise
L J
LJ
Mulder
D000328:Adult; D002487:Centers for Disease Control and Prevention, U.S.; D016603:Eosinophilia-Myalgia Syndrome / Q000175:diagnosis* / Q000453:epidemiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009864:Ontario; D018579:Patient Selection; D015995:Prevalence; D011792:Quebec; D014364:Tryptophan / Q000627:therapeutic use; D014481:United States
D014364:Tryptophan