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Volume 9, Number 10—October 2003

Research

Escherichia coli O157 Exposure in Wyoming and Seattle: Serologic Evidence of Rural Risk

Jason P. Haack*, Srdjan Jelacic†, Thomas E. Besser‡, Edward Weinberger*†, Donald J. Kirk§, Garry L. McKee¶, Shannon M. Harrison¶, Karl J. Musgrave¶, Gayle Miller¶, Thomas H. Price*#, and Phillip I. Tarr*†Comments to Author 
Author affiliations: *University of Washington School of Medicine, Seattle, Washington; †Children’s Hospital and Regional Medical Center, Seattle, Washington; ‡Washington State University, Pullman, Washington; §Star Valley Hospital, Afton, Wyoming; ¶Wyoming Department of Health, Cheyenne, Wyoming; #Puget Sound Blood Center, Seattle, Washington

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Table 2

Age, gender, history EIA value distribution in each population study, and median and range of OD for the EIA readingsa

Population A Population B Population C
Characteristics of populations
N =485
N =196
N =104
Age (y)
Mean (SD)
57 (15)
45 (12)
45 (12)




Male: female (not reported)
225:260
56:71 (69)
56:46 (2)
OD (EIA units)
Least squares mean
0.356b
0.328c
0.310
Median (range)
0.348 (0.185–1.115)
0.328 (0.149–0.522)
0.312 (0.222–0.441)
EIA, 80th percentile N+ (%)
EIA, 90th percentile N+ (%) 107 (22.0%)
60 (12.4%) 40 (20.4%)
19 (9.7%) 5 (4.8%)
2 (1.9%)

aEIA, enzyme immunoassay; OD, optical density; SD, standard deviation.
bp<0.001, population A (Star Valley) vs. either Casper or Seattle.
cp< 0.05, population C (Seattle) vs. population B (Casper).

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