(NY) Canine Influenza (CIV; H3N2) has been detected by multiple laboratories in respiratory samples from dogs in the New York City area. Most cases are in Brooklyn with at least one confirmed case on Long Island. The number of confirmed cases exceeds 40 at this time. So far, all of the positive influenza typing is H3N2. Influenza virus can typically be detected in acutely ill dogs by PCR testing of nasal swabs. Dogs with clinical signs for >7 days should be also be tested for CIV by Hemagglutination Inhibition antibody test on serum, as the virus may be undetectable in later stages of illness. Influenza vaccination history should be provided for all dogs tested for CIV antibodies. See frequently asked questions or get additional information.