Seasonal Influenza (Flu)

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Information on Swine Influenza/Variant Influenza Viruses

Swine influenza (swine flu) is a respiratory disease of pigs caused by type A influenza viruses that regularly cause outbreaks of influenza in pigs. Influenza viruses that commonly circulate in swine are called “swine influenza viruses” or “swine flu viruses.” Like human influenza viruses, there are different subtypes and strains of swine influenza viruses. The main swine influenza viruses circulating in U.S. pigs in recent years are:

swine triple reassortant (tr) H1N1 influenza virus
trH3N2 virus
trH1N2 virus

Swine flu viruses do not normally infect humans. However, sporadic human infections with swine influenza viruses 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.

The links below offer key information for different audiences about swine influenza in pigs and variant influenza virus infections in humans.

Swine Flu in Swine (pigs)

Swine Flu (Variant Influenza Viruses) in Humans

CDC Expert Commentary on Medscape

Title: Variant H3N2 Influenza Virus: What You Should Know
Posting Date: Monday, February 06, 2012
Faculty: Michael Jhung, MD, MPH
Lead Specialty: Infectious Diseases

Resources

Print Materials

Information and materials, including educational posters [389 KB, 1 page] that can be displayed around animal exhibits, are available in Compendium of Measures to Prevent Disease Associated with Animals in Public Settings, 2011.

Flyer: Key Facts For People Exhibiting Pigs at Fairs [640 KB, 2 pages]

Flyer: Take Action to Prevent the Spread of Flu Between People and Pigs at Fairs [438 KB, 2 pages]

Flyer: Issues for Fair Organizers to Consider When Planning Fairs [1.4 MB, 2 pages]

Materials from North Carolina Department of Agriculture and Consumer Services: Reduce Your Risk (English) [22 KB, 1 page], Reduce Your Risk (Spanish) [22 KB, 1 page]

Materials from Colorado Department of Public Health and Environment
Signs for Strollers at Fairs [85 KB, 2 pages]

Webinars

4-H National Headquarters, USDA, NIFA with CDC and APHIS “Healthy Fairs” Webinar, a webinar hosted by the United States Department of Agriculture (USDA)’s 4-H National Headquarters, Division of Youth & 4-H, National Institute of Food and Agriculture (NIFA) with presenters from the Centers for Disease Control and Prevention and USDA’s Animal and Plant Health Inspection Service (APHIC) addresses public health issues which are currently occurring at county fairs with regards to H3N2v outbreaks.