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Wednesday, May 20, 2026

Line for May 20, 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 pneumococcal disease

    The first pneumococcal vaccine is licensed in the U.S.

  2. 2
    Campaign smallpox

    WHO starts a plan to rid the world of smallpox

  3. 3
    Campaign Guinea worm

    Guinea worm: about 3.5 million cases a year, the starting line for eradication

  4. 4
    Vaccine measles

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

  5. 5
    Campaign polio

    The World Health Assembly resolves to eradicate polio

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