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Wednesday, February 25, 2026

Line for February 25, 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 hepatitis B

    The hepatitis B surface antigen is first described

  3. 3
    Discovery tetanus

    Kitasato isolates the tetanus organism from a patient

  4. 4
    Vaccine pneumococcal disease

    The first pneumococcal vaccine is licensed in the U.S.

  5. 5
    Vaccine smallpox

    Edward Jenner sees cowpox protect milkmaids from smallpox: vaccination begins

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