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Sunday, June 28, 2026

Line for June 28, 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
    Eradication smallpox

    The World Health Assembly declares the world free of smallpox

  2. 2
    Elimination polio

    The WHO African Region is certified free of wild polio

  3. 3
    Discovery rubella

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

  4. 4
    Vaccine polio

    The first oral polio vaccines are licensed

  5. 5
    Vaccine tetanus

    Tetanus toxoid is developed

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