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Volume 13, Number 2—February 2007

Dispatch

Surveillance for West Nile Virus in Clinic-admitted Raptors, Colorado

Nicole Nemeth*†Comments to Author , Gail Kratz*‡, Eric Edwards†, Judy Scherpelz*‡, Richard A. Bowen*, and Nicholas Komar†
Author affiliations: *Colorado State University, Fort Collins, Colorado, USA; †Centers for Disease Control and Prevention, Fort Collins, Colorado, USA; ‡Rocky Mountain Raptor Program, Fort Collins, Colorado, USA;

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Table

Results of West Nile virus testing in Colorado raptors admitted to a rehabilitation clinic, April 1–October 15, 2005

SpeciesNo. 
testedNo. 
positive (%)No. 
seroconvertedNo. 
swab positiveEarliest date
 of collection
Swainson hawk
28
8 (28.6)
5
3
Jun 27
Red-tailed hawk
13
4 (30.8)
2
3
Jul 28
Ferruginous hawk
1
1 (100.0)
0
1
Jul 31
American kestrel*
32
0



Peregrine falcon
2
1 (50.0)
1
1
Aug 16
Golden eagle
3
1 (33.3)
1
1
Aug 18
Great-horned owl
23
4 (17.4)
3
2
Apr 8
Common barn owl
24
0



Long-eared owl
5
0



Other species†
10
0



Total14119 (13.5)1211Apr 8

*The proportion of positives for kestrel was significantly less than for all other species combined (p = 0.0046, α = 0.0056; Fisher exact test with Bonferroni adjustment for 9 comparisons). No other statistically significant associations were observed for the species tested.

†Includes burrowing owl (n = 2), sharp-shinned hawk (n = 2), Cooper's hawk (n = 1), eastern screech owl (n = 1), merlin (n = 1), osprey (n = 1), prairie falcon (n = 1), and saw-whet owl (n = 1).

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