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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

Main Article

Table 3

Differences in West Nile virus seropositivity in birds by age, region, and habitat using chi-square analysis, Illinois, 2002

Comparison Samples, n (% total) N = 1,784 Antibody + (%)a
Habitat
Urban
524 (29.4%)
34 (6.49%)A

Natural
1,121 (62.8)
34 (3.03%)B

Captive
139 (8.2%)
26 (18.71%)C


χ 2 = 63.06
p < 0.0001




Region
Northern
412 (23.1%)
20 (4.85%)D

Central
796 (44.6%)
62 (7.79%)D

Southern
576 (32.3%)
12 (2.08%)E


χ 2 = 21.98
p < 0.0001




Ageb
Adult
455 (25.5%)
10 (2.2%)F

Hatch-year
508 (28.5%)
21 (4.1%)F
χ2 = 2.81 p < 0.096

aLike superscripts indicate no difference in pairwise comparisons.
b821 of the 1,784 birds had no age recorded at time of collection. The remaining 963 were used for the age analysis.

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