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Volume 10, Number 6—June 2004

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
524 (29.4%)
34 (6.49%)A

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

139 (8.2%)
26 (18.71%)C

χ 2 = 63.06
p < 0.0001

412 (23.1%)
20 (4.85%)D

796 (44.6%)
62 (7.79%)D

576 (32.3%)
12 (2.08%)E

χ 2 = 21.98
p < 0.0001

455 (25.5%)
10 (2.2%)F

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.

Main Article

Page created: February 22, 2011
Page updated: February 22, 2011
Page reviewed: February 22, 2011
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