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Monday, April 27, 2026

Line for April 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
    Vaccine polio

    The first oral polio vaccines are licensed

  2. 2
    Campaign smallpox

    WHO launches an intensified plan to eradicate smallpox

  3. 3
    Vaccine pneumococcal disease

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

  4. 4
    Discovery rubella

    Rubella is described as a disease of its own ("German measles")

  5. 5
    Vaccine malaria

    WHO recommends the first malaria vaccine for wide use in children

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