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Tuesday, April 7, 2026

Line for April 7, 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 polio

    The first oral polio vaccines are licensed

  2. 2
    Vaccine pneumococcal disease

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

  3. 3
    Discovery tetanus

    Kitasato isolates the tetanus organism from a patient

  4. 4
    Discovery diphtheria

    The diphtheria bacterium is first seen under the microscope

  5. 5
    Treatment hepatitis C

    Treatments that can cure hepatitis C become available

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