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Volume 10, Number 6—June 2004

Dispatch

Antibody Prevalence of West Nile Virus in Birds, Illinois, 2002

Adam M. Ringia*Comments to Author , Bradley J. Blitvich†, Hyun-Young Koo‡, Marshall Van de Wyngaerde*, Jeff D. Brawn‡, and Robert J. Novak*
Author affiliations: *Illinois Natural History Survey, Champaign, Illinois, USA; †Colorado State University, Fort Collins, Colorado, USA; ‡University of Illinois, Champaign, Illinois, USA

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Table 2

Logistic regression analysis of Illinois avian WNV antibody prevalence, 2002a

Factor DF Wald χ2 p value
Region
2
17.65
< 0.0001
Month
10
44.80
< 0.0001
Habitat (urban/natural)
1
1.29
0.26
Full model
13
78.21
< 0.0001
r2 = 0.14

aWNV, West Nile virus; DF, degrees of freedom.
bDependent variable, presence or absence of WNV antibody.

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