Volume 5, Number 6—December 1999
Dispatch
Computer-Generated Dot Maps as an Epidemiologic Tool: Investigating an Outbreak of Toxoplasmosis
Steven B. Eng*
, Denise H. Werker†‡, Arlene S. King‡, Stephen A. Marion§, Alison Bell‡¶, Judith L. Issac-Renton†§, G. Stewart Irwin#, and William R. Bowie§
, Denise H. Werker†‡, Arlene S. King‡, Stephen A. Marion§, Alison Bell‡¶, Judith L. Issac-Renton†§, G. Stewart Irwin#, and William R. Bowie§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.
