Pigs can be infected with their own influenza viruses (called swine influenza) that are usually different from human flu viruses. While rare, influenza can spread from pigs to people and from people to pigs. When people get swine flu viruses, it’s usually after contact with pigs. This has happened in different settings, including fairs. Right now, the Centers for Disease Control and Prevention (CDC) is concerned about a flu virus that has been found in U.S. pigs and that has infected people too. This virus – called H3N2v – may spread more easily from pigs to humans than is usual for swine flu viruses. prevent-spread-flu-pigs-at-fairs.pdf

Stephen B. Thacker CDC Library collection