Volume 10, Number 12—December 2004
West Nile Virus Outbreak in North American Owls, Ontario, 2002
|Speciesc||Exposure rate (%)||WNV-related DR (%)|
|Snowy Owl (Bubo scandiacus)||100||100|
|Northern Hawk Owl (Surnia ulula)||100||100|
|Northern Saw-whet Owl (Aegolius acadicus)||92.3||92.3|
|Great Gray Owl (Strix nebulosa)||100||91.3|
|Boreal Owl (Ae. funereus)||90.9||90.9|
|Northern Pygmy Owl (Glaucidium gnoma)||50||16.7|
|Short-eared Owl (Asio flammeus)||100||12.5|
|Flammulated Owl (Otus flammeolus)||22.2||11.1|
|Great Horned Owl (B. virginianus)||100||4.5|
|Burrowing Owl (Athene cunicularia)||90||0|
|Eastern Screech Owl (Megascops asio)||72.7||0|
|Barn Owl (Tyto alba)||80||0|
aExposure defined as positive reverse transcription–polymerase chain reaction result (for birds that died during the outbreak) (Table 1) or positive serologic results (for birds that survived the outbreak) (Table 2).
bWNV, West Nile virus; DR, death rate.
cOnly species for which n > 6 are shown.
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