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Volume 5, Number 6—December 1999

Dispatch

Computer-Generated Dot Maps as an Epidemiologic Tool: Investigating an Outbreak of Toxoplasmosis

Steven B. Eng*Comments to Author , Denise H. Werker†‡, Arlene S. King‡, Stephen A. Marion§, Alison Bell‡¶, Judith L. Issac-Renton†§, G. Stewart Irwin#, and William R. Bowie§
Author affiliations: *Capital Regional District Health Department, Victoria, B.C., Canada; †Health Canada, Ottawa, Ontario, Canada; ‡British Columbia Centre for Disease Control, Vancouver, B.C., Canada; §University of British Columbia, Vancouver, B.C., Canada; ¶Centers for Disease Control and Prevention, Atlanta, Georgia, USA; and #Greater Victoria Water District, Victoria, B.C., Canada

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Table

Linear trend analysis of acute and nonacute infections with Toxoplasma gondii among screened pregnant women, by degree of exposure to Humpback Reservoir water

Rank of exposure Exposure score Infected (cases) Never infected (controls) Odds ratio
(relative to baseline) Trend test
p valuea
Acute No 1 4 983 1.00
(recent
infection)
Intermediate 2 10 1,078 2.28
High 3 22 1,497 3.61 0.01
Nonacute No 1 64 983 1.00
(past
infection)
Intermediate 2 71 1,078 1.01
High 3 81 1,497 0.83 0.25

aExtended Mantel-Haenszel chi-square, Schlesselmann JJ. Case-control studies, New York, Oxford University Press, 1982.

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