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Wednesday, October 21, 2026

Line for October 21, 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 rotavirus

    Rotavirus is identified as a cause of diarrhea

  2. 2
    Vaccine shingles

    The first shingles (zoster) vaccine is licensed in the U.S.

  3. 3
    Vaccine pneumococcal disease

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

  4. 4
    Elimination rubella

    Endemic rubella is declared eliminated in the United States

  5. 5
    Eradication smallpox

    The World Health Assembly declares the world free of smallpox

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