Variant Influenza Viruses in Humans
Swine flu viruses do not normally infect humans. However, sporadic human infections with influenza viruses that normally circulate in swine and not people have occurred. When this happens, these viruses are called “variant viruses.” They also can be denoted by adding the letter “v” to the end of the virus subtype designation. Human infections with H1N1v, H3N2v and H1N2v viruses have been detected in the United States.
Information for Specific Groups
- Key Facts for People Exhibiting Pigs at Fairs [545 KB, 2 pages]
- Take Action to Prevent the Spread of Flu Between People and Pigs [1.3 MB, 2 pages]
- Educational Posters [389 KB, 1 page]
- Compendium of Measures to Prevent Disease Associated with Animals in Public Settings, 2013.
- Reduce Your Risk (English) [22 KB, 1 page] | (Spanish) [22 KB, 1 page]Measures to Minimize Influenza Transmission at Swine Exhibitions, 2018 – NASAHO and NASPHV [97 KB, 8 pages]
Videos / Podcast
Dr. Lyn Finelli discusses CDC’s recommendations for reducing the risk of infection with H3N2v flu viruses for fairgoers and swine exhibitors.
- Page last reviewed: September 12, 2016
- Page last updated: May 15, 2018
- Content source:
- Centers for Disease Control and Prevention, National Center for Immunization and Respiratory Diseases (NCIRD)
- Page maintained by: Office of the Associate Director for Communication, Digital Media Branch, Division of Public Affairs