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Friday, February 13, 2026

Line for February 13, 2026

Put these 5 milestones in time order, earliest at the top. The years appear when you lock in your order.

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Earliest

  1. 1
    Discovery hepatitis B

    The hepatitis B surface antigen is first described

  2. 2
    Campaign smallpox

    WHO launches an intensified plan to eradicate smallpox

  3. 3
    Vaccine chickenpox

    The chickenpox (varicella) vaccine is licensed in the U.S.

  4. 4
    Campaign polio

    The World Health Assembly resolves to eradicate polio

  5. 5
    Vaccine hepatitis B

    The first recombinant hepatitis B vaccine is licensed

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