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.

CDC Spotlight: 4 Variant Virus Infections Linked to Pig Exposures

CDC Spotlight: 4 Variant Virus Infections Linked to Pig

Health Care Guidance for Human Infections with Variant Influenza Viruses

Health Care Guidance for Human Infections with Variant Influenza Viruses

Issues for Fair Organizers to Consider When Planning Fairs

Issues for Fair Organizers to Consider When Planning Fairs

Information for Specific Groups

Resources