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Volume 6, Number 4—August 2000

Dispatch

Ehrlichia chaffeensis Antibodies in White-Tailed Deer, Iowa, 1994 and 1996

Linda Mueller-Anneling*, Mary J. Gilchrist†, and Peter S. Thorne*Comments to Author 

Author affiliations: *University of Iowa College of Public Health, Iowa City, Iowa, USA; and †University of Iowa Hygienic Laboratory, Iowa City, Iowa, USA

Article in Chinese

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Table 2

Deer seropositivity for antibodies to Ehrlichia chaffeensis, Iowa, 1994 and 1996.

Year Result North Central South Statewide
1994 No. of samples 444 617 714 1775
% of population sampled 0.59 0.57 0.51 0.55
No. positive 6 26 189 221
% positive 1.35 4.21 26.5 12.5
Est. no. of positive deer 1,017 4,523 37,183 42,724
Odds ratio 1.0 3.2 26.3a
1996 No. of samples 318 374 410 1,102
% of population sampled 0.32 0.31 0.28 0.30
No. positive 0b 18 135 153
% positive 0 4.81 32.9 13.9
Est. no. of positive deer 0 5,782 48,919 54,701
Odds ratio 1.0 16.1 156.1c

aChi square for trend = 183, p<0.00001
bOne positive case was assumed for this cell to allow calculation of the odds ratio
cChi square for trend = 173, p<0.00001

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