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Influenza milestones 1917 – 2009 timeline
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  • Description:
    1917

    • [Illustration of a male and female with the number 54 under the female icon and 48 under the male icon]

    • United States enters World War I. U.S. life expectancy is 54 years of age for women and 48 years of age for men.

    1918

    • [Illustration of a male and female and an arrow pointing down, with the number 42 under the female icon and 36 under the male icon]

    • Spring and fall waves of influenza (”flu”) activity cause the average life expectancy in the United States to fall by 12 years.

    1919

    • [Illustration of a globe and arrows circling the globe]

    • Third wave of pandemic flu activity occurs. Pandemic subsides, but virus (H1N1) continues to circulate seasonally for 38 years.

    1930

    • [Illustration of a test tube]

    • First isolation of influenza, proving that flu is caused by a virus not a bacterium.

    1957

    • [Illustration of an influenza virus]

    • H2N2 flu virus emerges to trigger a pandemic, replacing the 1918 H1N1 pandemic virus.

    1960

    • [Illustration of a flu vaccine syringe]

    • The U.S. Public Health Service recommends annual flu vaccination for people at high risk of serious flu complications.

    1968

    • [Illustration of an influenza virus]

    • H3N2 flu virus emerges to trigger a pandemic, replacing H2N2 virus.

    2005

    • [Illustration of a DNA strand]

    • Genome of the 1918 pandemic flu virus is fully sequenced.

    2009

    • [Illustration of three people in a circle with arrows points from person to person]

    • H1N1 viruses distantly related to the 1918 virus emerge to trigger a pandemic.

    pandemic-flu-milestone-infographic.pdf

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