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  1. 2009 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) …

  2. 2009 H1N1 Pandemic (H1N1pdm09 virus) | Pandemic Influenza (Flu) …

    Jun 11, 2019 · A summary of key events of the 2009 H1N1 pandemic and the CDC's response activities between April 2009 and …

  3. H1N1 Influenza Pandemic | Office of Readiness and Response | CDC

    Apr 15, 2009 · The 2009 H1N1 was a unique combination of influenza virus genes never previously identified in either animals or …

  4. influenza pandemic (H1N1) of 2009 - Encyclopedia Britannica

    Influenza pandemic (H1N1) of 2009, the first major influenza outbreak in the 21st century, noted for its rapid global spread, which …

  5. Pandemic 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 …

  6. Influenza A (H1N1) outbreak - World Health Organization (WHO)

    Before the H1N1 pandemic in 2009, the influenza A (H1N1) virus had never been identified as a cause of infections in people. …

  7. H1N1 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 …

  8. Swine Flu (H1N1): What Is It, Causes, Treatments & Prevention

    Aug 5, 2022 · Swine flu is also known as H1N1. Swine flu is a respiratory infection a flu virus causes. Swine flu gets its name from a …

  9. 2009 H1N1 Pandemic Timeline | Pandemic Influenza (Flu) | CDC

    May 8, 2019 · In 2009, a new H1N1 influenza virus emerged, causing the first global flu pandemic in 40 years. Below is a timeline of …

  10. Origins and Spread of H1N1 Influenza: A Comprehensive Overview

    Nov 17, 2025 · The 2009 H1N1 influenza pandemic (H1N1pdm09) was the first global influenza outbreak of the 21st century. This …