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  2. Influenza A virus subtype H1N1 - Wikipedia

    en.wikipedia.org/wiki/Influenza_A_virus_subtype_H1N1

    The G4 virus, also known as the "G4 swine flu virus" (G4) and "G4 EA H1N1", is a swine influenza virus strain discovered in China. [68] The virus is a variant genotype 4 (G4) Eurasian avian-like (EA) H1N1 virus that mainly affects pigs, but there is some evidence of it infecting people. [68]

  3. Pandemic H1N1/09 virus - Wikipedia

    en.wikipedia.org/wiki/Pandemic_H1N1/09_virus

    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. Swine influenza - Wikipedia

    en.wikipedia.org/wiki/Swine_influenza

    For example, during the 2009 swine flu outbreak in the United States, the CDC advised physicians to "consider swine influenza infection in the differential diagnosis of patients with acute febrile respiratory illness who have either been in contact with persons with confirmed swine flu, or who were in one of the five U.S. states that have ...

  5. Type A influenza vaccine - Wikipedia

    en.wikipedia.org/wiki/Type_A_influenza_vaccine

    Monovalent type A influenza vaccines are generally indicated during the pandemic or the flu for everyone without contraindications. According to the Advisory Committee on Immunization Practices (ACIP) under the Centre for Disease Control and Prevention (CDC), people aged above 10 are recommended to take one dose of H1N1 vaccine while those who are 6 months to 9 years old should be injected ...

  6. Influenza A virus - Wikipedia

    en.wikipedia.org/wiki/Influenza_A_virus

    In the 21st century, a strain of H1N1 flu (since titled "H1N1pdm09") was antigenically very different from previous H1N1 strains, leading to a pandemic in 2009. Because of its close resemblance to some strains circulating in pigs, this became known as "swine flu". [45] Influenza A virus continues to circulate and evolve in birds and pigs.

  7. Template:Notable flu pandemics - Wikipedia

    en.wikipedia.org/wiki/Template:Notable_flu_pandemics

    This template is used in these pages. Major modern influenza pandemics [1] [2] Name Date World pop. ... Spanish flu [4] 1918–20 1.80 billion H1N1: 1.80 ...

  8. Hemagglutinin (influenza) - Wikipedia

    en.wikipedia.org/wiki/Hemagglutinin_(influenza)

    Influenza hemagglutinin (HA) or haemagglutinin [p] (British English) is a homotrimeric glycoprotein found on the surface of influenza viruses and is integral to its infectivity. Hemagglutinin is a class I fusion protein , [ 1 ] [ 2 ] having multifunctional activity as both an attachment factor and membrane fusion protein .

  9. Historical annual reformulations of the influenza vaccine

    en.wikipedia.org/wiki/Historical_annual...

    The following is a list of WHO recommended strains for the Northern Hemisphere influenza season. Starting in the 2012–2013 season, the recommendation shifted to include the composition of a quadrivalent influenza vaccine (QIV) that contains both influenza B lineages, alongside a trivalent influenza vaccine (TIV) containing one influenza B lineage.