Descriptive analysis of endemic cryptosporidiosis cases reported in Ontario, 1996-1997.
Endemic cryptosporidiosis in Ontario was studied using notifiable disease data from the Ontario Ministry of Health for the years 1996-1997 inclusive. For this study period, 451 endemic cases were identified, corresponding to a provincial mean annual age- and sex-adjusted incidence rate of 2.13 cases per 100,000. Children under five years of age had the highest incidence of disease. Males had a higher incidence than females, except for those 15-19 years of age. Five percent of cases were reported as HIV-positive or having AIDS. The proportion of cases occurring between July and November inclusive (63%) was significantly higher than expected (42%) assuming no seasonal variation (p < 0.01). The proportion of rural cases observed (29%) was significantly higher than expected (17%) based on the Ontario population (p < 0.01). Travel to or prior residence in an endemic area was identified in 22% of the cases where a risk setting was reported (n = 265).
Majowicz
S E
SE
Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario.
Michel
P
P
Aramini
J J
JJ
McEwen
S A
SA
Wilson
J B
JB
D017088:AIDS-Related Opportunistic Infections / Q000150:complications / Q000453:epidemiology; D000293:Adolescent; D000328:Adult; D003457:Cryptosporidiosis / Q000150:complications / Q000453:epidemiology*; D003625:Data Collection; D019353:Endemic Diseases / Q000706:statistics & numerical data*; D006801:Humans; D015994:Incidence; D008297:Male; D009864:Ontario / Q000453:epidemiology