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Thursday, February 26, 2026

Line for February 26, 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
    Campaign tuberculosis

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

  3. 3
    Discovery measles

    A Scottish physician shows measles is caused by an infectious agent in the blood

  4. 4
    Vaccine mumps

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

  5. 5
    Vaccine tetanus

    Tetanus toxoid is developed

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