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
- Graphic: Flu Can Spread Between Pigs and People Cdc-pdf[1.2 MB, 2 pages]
- Key Facts for People Exhibiting Pigs at Fairs Cdc-pdf[545 KB, 2 pages]
- Take Action to Prevent the Spread of Flu Between People and Pigs Cdc-pdf[1.3 MB, 2 pages]
- Educational Poster Cdc-pdf[389 KB, 1 page]External
- Compendium of Measures to Prevent Disease Associated with Animals in Public Settings, 2013External
- Reduce Your Risk (English) Cdc-pdf[22 KB, 1 page]External | (Spanish) Cdc-pdf[22 KB, 1 page]External
- Measures to Minimize Influenza Transmission at Swine Exhibitions, 2018 – NASAHO and NASPHV Cdc-pdf[97 KB, 8 pages]External
Dr. Lyn Finelli discusses CDC’s recommendations for reducing the risk of infection with H3N2v flu viruses for fairgoers and swine exhibitors.