Influenza in Animals
CDC has compiled two tables that showing the different hemagglutinin and neuraminidase subtypes and the species in which they have been detected.
Influenza A viruses are found in many different animals, including ducks, chickens, pigs, whales, horses, seals and cats.
Influenza B viruses circulate widely only among humans.
Influenza A viruses are divided into subtypes based on two proteins on the surface of the virus: the hemagglutinin (H) and the neuraminidase (N). There are 18 different hemagglutinin subtypes and 11 different neuraminidase subtypes. All known subtypes of influenza A viruses have been found among birds, except subtype H17N10 and H18N11 which have only been found in bats.
While it is unusual for people to get influenza infections directly from animals, sporadic human infections and outbreaks caused by certain avian influenza A viruses have been reported.
- Update: Influenza Activity — United States and Worldwide, May 19–September 28, 2019, and Composition of the 2020 Southern Hemisphere Influenza Vaccine Friday, October 11, 2019
- Weekly U.S. Influenza Surveillance Report Friday, October 11, 2019
- Get Vaccinated to Fight Flu Thursday, September 26, 2019
- Influenza Vaccination Coverage - FluVaxView Thursday, September 26, 2019
- National Press Conference Kicks Off 2019-2020 Flu Vaccination Campaign Thursday, September 26, 2019