What is H1N1 Influenza A Virus (Swine Flu)?

  • H1N1 (referred to as “swine flu” early on) is a new influenza virus causing illness in people.
  • This new virus was first detected in people in April 2009 in the United States.
  • H1N1 Influenza A (swine flu) is transmitted by respiratory secretions
  • This virus was originally referred to as “swine flu” because laboratory testing showed that many of the genes in this new virus were very similar to influenza viruses that normally occur in pigs in North America.

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