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Swine influenza

Regularly circulating in North American swine, common strains of swine influenza include H1N1, H1N2 and H3N2.

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Learn about H1N1 influenza in animals, clinical symptoms, and what to do if you have or suspect H1N1 in your animals.

H1N2 viruses commonly circulate in North American swine herds.


Swine influenza viruses do not normally infect people. However, there have been infrequent human infections from these viruses. Cases usually occur following direct or indirect exposure to pigs. This is not a food-borne illness associated with eating pork.

Learn more about Pandemic H1N1 and H1N2 swine influenza.