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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 1

Birds, listed alphabetically by order, tested for WNV antibody in Illinois in 2002, including number of birds positive and number testeda

Order Common name No. tested WNV-positive no. (%) 95% CI
Anseriformes
Canada Goose
253
3 (1.2)
0.3 to 3.4

Wood Duck
120
3 (2.5)
0.5 to 7.1

3 additional species
35
0

Columbiformes
Mourning Dove
11
1 (9.1)
0.2 to 41.3

Rock Doveb
20
11 (55.0)
31.5 to 76.9
Galliformes
Chukarb
22
6 (27.3)
10.7 to 50.2

Domestic Chickenb
63
5 (7.9)
2.6 to 17.6

2 additional species
16
0

Passeriformes
Cedar Waxwing
5
1 (20.0)
0.5 to 71.6

Blue Grosbeak
2
1 (50.0)
1.2 to 98.7

Indigo Bunting
28
1 (3.6)
0.1 to 18.4

Northern Cardinal
129
16 (12.4)
7.3 to 9.4

American Crow
157
5 (3.2)
1.0 to 7.3

Red-winged Blackbird
39
3 (7.7)
1.6 to 20.9

Brown Thrasher
19
2 (10.5)
1.3 to 33.1

Gray Catbird
72
6 (8.3)
3.1 to 17.3

Ovenbird
32
1 (3.1)
0.1 to 16.2

House Sparrow
185
21 (11.4)
7.1 to 16.8

American Robin
79
3 (3.8)
0.8 to 10.7

Swainson’s Thrush
32
1 (3.1)
0.1 to16.2

45 additional species
422
0 (0)

Strigiformes
Great Horned Owlb
9
4 (44.4)
13.7 to 78.8

2 additional species
3
0

Other (5 orders)
10 species
31
0

Total (10 orders) 81 species 1784 94 (5.3) 4.2 to 6.4

aWNV, West Nile virus; CI, confidence interval.
bIndicates captive specimens.

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