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Sunday, June 21, 2026

Line for June 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
    Vaccine measles, mumps, rubella, chickenpox

    The combined MMRV vaccine is licensed

  2. 2
    Discovery diphtheria

    The diphtheria bacterium is first seen under the microscope

  3. 3
    Vaccine pneumococcal disease

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

  4. 4
    Campaign smallpox

    WHO launches an intensified plan to eradicate smallpox

  5. 5
    Vaccine measles, mumps, rubella

    The combined MMR vaccine is licensed

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