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Saturday, January 3, 2026

Line for January 3, 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 chickenpox

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

  2. 2
    Vaccine polio

    The first oral polio vaccines are licensed

  3. 3
    Campaign smallpox

    WHO starts a plan to rid the world of smallpox

  4. 4
    Discovery hepatitis B

    The hepatitis B surface antigen is first described

  5. 5
    Vaccine measles, mumps, rubella, chickenpox

    The combined MMRV vaccine is licensed

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