Volume 13, Number 2—February 2007
Surveillance for West Nile Virus in Clinic-admitted Raptors, Colorado
|Species||No. tested||No. positive (%)||No. seroconverted||No. swab positive||Earliest 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|
|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||–||–||–|
|Total||141||19 (13.5)||12||11||Apr 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).