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Tuesday, July 21, 2026

Line for July 21, 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 diphtheria

    The diphtheria bacterium is first seen under the microscope

  2. 2
    Vaccine pneumococcal disease

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

  3. 3
    Elimination measles

    Measles is declared eliminated from the United States

  4. 4
    Vaccine chickenpox

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

  5. 5
    Elimination malaria

    WHO certifies malaria gone from the United States

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