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Saturday, April 4, 2026

Line for April 4, 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 tetanus

    Tetanus toxoid is developed

  2. 2
    Discovery rubella

    The rubella virus is isolated

  3. 3
    Vaccine mumps

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

  4. 4
    Discovery measles

    The measles virus is isolated in tissue culture

  5. 5
    Vaccine polio

    The first oral polio vaccines are licensed

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