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Friday, February 27, 2026

Line for February 27, 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
    Campaign tuberculosis

    March 24 is recognized as World TB Day, a century after Koch

  2. 2
    Discovery diphtheria

    The diphtheria bacterium is first seen under the microscope

  3. 3
    Vaccine polio

    The first oral polio vaccines are licensed

  4. 4
    Vaccine smallpox

    Edward Jenner sees cowpox protect milkmaids from smallpox: vaccination begins

  5. 5
    Eradication smallpox

    The last known natural smallpox case, in Somalia

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