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American Journal of Epidemiology Vol. 130, No. 5: 976-980
Copyright © 1989 by The Johns Hopkins University School of Hygiene and Public Health

research-article

ABSENCE OF SIGNIFICANT DIFFERENCES IN INTESTINAL PARASITE PREVALENCE ESTIMATES AFTER EXAMINATION OF EITHER ONE OR TWO STOOL SPECIMENS

THERESA W. GYORKOS1,2,3,, J.DICK MACLEAN2 and CLIFFORD G. LAW2

1Department of Epidemiology and Biostatistics, McGill University, and Division of Clinical Epidemiology, Montreal General Hospital Montréal, Québec, Canada
2McGill University Centre for Tropical Diseases, Montreal General Hospital Montréal, Québec, Canada
3Département de Microbiologie et Immunologie, Faculté de Médecine, Université de Montréal Montréal, Québec, Canada.

Reprint requests to Dr. Theresa W. Gyorkos, Division of Clinical Epidemiology, Montreal General Hospital, 1650 Cedar Ave., Montréal, Québec, Canada H3G 1A4

The authors undertook a retrospective search of intestinal parasite laboratory records obtained from 200 consecutive-day pairs of stool specimens to compare prevalence estimates from the first and second stool examinations. The laboratory results had previously been recorded as part of a screening program offered to Southeast Asian refugees arriving in Montreal, Quebec, Canada, between July 1982 and February 1983. No statistically significant differences in either overall prevalences or parasite-specific prevalences were observed. This suggests that, at least in some population-based situations, single stool examinations provide estimates of intestinal parasite prevalence which are as valid as those from the routine examination of two consecutive-day specimens. Blinded studies must be undertaken to accurately assess the true value of multiple specimen submission in epidemiologic studies.

mass screening; parasites; refugees


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