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  1. en.wikipedia.org › wiki › Swine_influenzaSwine influenza - Wikipedia

    Swine influenza virus (SIV) or swine-origin influenza virus (S-OIV) refers to any strain of the influenza family of viruses that is endemic in pigs. As of 2009, identified SIV strains include influenza C and the subtypes of influenza A known as H1N1 , H1N2 , H2N1, H3N1 , H3N2 , and H2N3 .

  2. en.wikipedia.org › wiki › 2009_swine_flu_pandemic2009 swine flu pandemic - Wikipedia

    The 2009 swine flu pandemic, caused by the H1N1/swine flu/influenza virus and declared by the World Health Organization (WHO) from June 2009 to August 2010, was the third recent flu pandemic involving the H1N1 virus (the first being the 1918–1920 Spanish flu pandemic and the second being the 1977 Russian flu ).

  3. en.wikipedia.org › wiki › Pandemic_H1N1Pandemic H1N1/09 virus - Wikipedia

    The pandemic H1N1/09 virus is a swine origin influenza A virus subtype H1N1 strain that was responsible for the 2009 swine flu pandemic. This strain is often called swine flu by the public media due to the prevailing belief that it originated in pigs. The virus is believed to have originated around September 2008 in central Mexico.

  4. www.mayoclinic.org › diseases-conditions › swine-fluH1N1 flu (swine flu) - Symptoms and causes - Mayo Clinic

    Mar 23, 2023 · The H1N1 flu, sometimes called swine flu, is a type of influenza A virus. During the 2009-10 flu season, a new H1N1 virus began causing illness in humans. It was often called swine flu and was a new combination of influenza viruses that infect pigs, birds and humans.

  5. www.who.int › emergencies › situationsInfluenza A (H1N1) outbreak - World Health Organization (WHO)

    Unlike typical seasonal flu patterns, the new virus caused high levels of summer infections in the northern hemisphere, and then even higher levels of activity during cooler months. The new virus also led to patterns of death and illness not normally seen in influenza infections.

  6. www.cdc.gov › flu › swinefluInformation on Swine/Variant Influenza | CDC

    Aug 4, 2023 · Swine influenza 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.”

  7. www.nationalgeographic.com › science › articleOrigins of the swine flu pandemic - National Geographic

    Jun 11, 2009 · The viral menagerie included two samples of the current pandemic strain (the virus formerly known as swine flu and now referred to as swine-origin influenza virus (S-OIV)).