Influenza H1N1 pandemic

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  • First case

    First infection in a human of influenza AH1N1 detected in California

  • WHO warning

    The World Health Organization (WHO) declared a state of public health emergency of international interest.

  • Phase 5

    The WHO intensified the alert level for an influenza pandemic from phase 4 to phase 5, indicating an inminent pandemic

  • Classes suspension

    980 schools suspended classes and 607 778 students were affected.
  • Period: to

    Pandemic peak

  • Phase 6

    The World Health Organization (WHO) declared the pandemic and raised the level of the global pandemic alert to Phase 6

  • U.S. infected

    The whole United States presented cases

  • 1 million

    The CDC (Center for Disease Control) estimated that there were at least 1 million cases of 2009 H1N1 influenza virus infections in the United States.

  • Decrease

    H1N1 influenza activity decreased in most countries.

  • Second wave

    The second wave of 2009 H1N1 influenza activity began in the US. USA

  • Vaccines

    The Food & Drug Administration announced the approval of four 2009 H1N1 influenza vaccines.

  • 2009 National H1N1 Flu Vaccination Campaign

    The first vaccines were applied in the U.S.

  • Second peak

    The second wave of H1N1 influenza activity peaked in the US.

  • Re-opened schools

    Every school in the U.S. was now active again

  • Massive vaccination

    The first 100 million doses of the 2009 H1N1 influenza vaccine were available.
  • Period: to

    NIVW

    The President of the United States declared National Influenza Vaccination Week (NIVW)

  • End of the pandemic

    The WHO announced the end of the 2009 H1N1 influenza pandemic.