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Wednesday, April 22, 2026

Line for April 22, 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
    Campaign smallpox

    WHO starts a plan to rid the world of smallpox

  2. 2
    Vaccine chickenpox

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

  3. 3
    Vaccine mumps

    The Jeryl Lynn mumps vaccine is licensed in the U.S.

  4. 4
    Eradication rinderpest (a cattle disease)

    The last identified case of rinderpest, the second disease ever eradicated

  5. 5
    Discovery measles

    The measles virus is isolated in tissue culture

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