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Wednesday, September 30, 2026

Line for September 30, 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
    Vaccine measles

    The first live measles vaccine is licensed in the U.S.

  2. 2
    Discovery measles

    A Scottish physician shows measles is caused by an infectious agent in the blood

  3. 3
    Treatment bacterial infections

    A Nobel Prize for penicillin "and its curative effect"

  4. 4
    Vaccine mumps

    The Jeryl Lynn mumps vaccine is licensed in the U.S.

  5. 5
    Eradication smallpox

    The last known natural smallpox case, in Somalia

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