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Monday, July 20, 2026

Line for July 20, 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 mumps

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

  2. 2
    Campaign smallpox

    WHO starts a plan to rid the world of smallpox

  3. 3
    Discovery hepatitis B

    The hepatitis B surface antigen is first described

  4. 4
    Vaccine polio

    The inactivated polio vaccine (IPV) is licensed

  5. 5
    Vaccine hepatitis A

    The first hepatitis A vaccines are licensed in the U.S.

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