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Thursday, April 23, 2026

Line for April 23, 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
    Elimination malaria

    WHO certifies malaria gone from the United States

  2. 2
    Vaccine measles, mumps, rubella

    The combined MMR vaccine is licensed

  3. 3
    Vaccine polio

    The inactivated polio vaccine (IPV) is licensed

  4. 4
    Discovery rubella

    Rubella is described as a disease of its own ("German measles")

  5. 5
    Vaccine measles

    An improved, weaker measles vaccine goes into use

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