Canine influenza virus (CIV) subtypes H3N8 and H3N2 are endemic among domestic dog ( Canis lupus familiaris ) populations in the northeastern US. Infection of free-ranging carnivores with influenza virus has been sporadically reported. Generalist mesocarnivores that exploit anthropogenic, peri-urban habitats share a wide interface with domestic dogs that allows for the transmission of infectious disease. To investigate the potential exposure of free-ranging canids to CIV in Pennsylvania, US, serum samples were obtained from freshly killed coyotes ( Canis latrans, n=67), grey foxes ( Urocyon cinereoargenteus, n=8), and red foxes ( Vulpes vulpes, n=5) from 24 counties. Animals were harvested during the January-February 2017 hunting season. We failed to detect antibodies to CIV subtypes H3N2 and H3N8 by using hemagglutination inhibition assays validated for domestic dogs. Results suggest CIV was not endemic in free-ranging canid populations in Pennsylvania or that prevalence was too low to be detected by our limited sample size.
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