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Thursday, May 28, 2026

Line for May 28, 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 polio

    The inactivated polio vaccine (IPV) is licensed

  2. 2
    Discovery diphtheria

    The diphtheria bacterium is first seen under the microscope

  3. 3
    Vaccine pertussis

    The first whole-cell whooping cough (pertussis) vaccines are licensed in the U.S.

  4. 4
    Vaccine measles, mumps, rubella

    The combined MMR vaccine is licensed

  5. 5
    Elimination polio

    The last case of wild polio acquired in the United States

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