Canine Influenza Virus (CIV) | Merck Veterinary Manual
Two strains of the canine influenza virus (CIV) have been identified, H3N8 and H3N2. The H3N8 strain was first identified in the USA in 2004 and had evolved from equine influenza. The H3N2 strain was identified as originating from Asia as an Asian avian influenza. An outbreak of H3N2 was identified in Chicago in 2015.
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