Line for March 16, 2026

Earliest

1. 1
   Vaccine smallpox

   Edward Jenner sees cowpox protect milkmaids from smallpox: vaccination begins

   Position 12345
2. 2
   Treatment bacterial infections

   A Nobel Prize for penicillin "and its curative effect"

   Position 12345
3. 3
   Vaccine measles

   An improved, weaker measles vaccine goes into use

   Position 12345
4. 4
   Discovery tetanus

   Kitasato isolates the tetanus organism from a patient

   Position 12345
5. 5
   Elimination polio

   The WHO African Region is certified free of wild polio

   Position 12345

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