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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.

Main Article

Page created: February 22, 2011
Page updated: February 22, 2011
Page reviewed: February 22, 2011
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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