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Wednesday, October 28, 2026

Line for October 28, 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
    Discovery hepatitis B

    The hepatitis B surface antigen is first described

  2. 2
    Vaccine pertussis

    The first whole-cell whooping cough (pertussis) vaccines are licensed in the U.S.

  3. 3
    Vaccine measles, mumps, rubella, chickenpox

    The combined MMRV vaccine is licensed

  4. 4
    Vaccine measles

    An improved, weaker measles vaccine goes into use

  5. 5
    Vaccine hepatitis B

    The first recombinant hepatitis B vaccine is licensed

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