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Wednesday, August 5, 2026

Line for August 5, 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 polio

    The inactivated polio vaccine (IPV) is licensed

  3. 3
    Elimination polio

    The last case of wild polio acquired in the United States

  4. 4
    Vaccine rotavirus

    The first rotavirus vaccine is licensed, then withdrawn the next year

  5. 5
    Vaccine tetanus

    Tetanus toxoid is developed

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