Line for January 31, 2026

Earliest

1. 1
   Elimination polio

   The last case of wild polio acquired in the United States

   Position 12345
2. 2
   Vaccine Hib disease

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

   Position 12345
3. 3
   Treatment bacterial infections

   A Nobel Prize for penicillin "and its curative effect"

   Position 12345
4. 4
   Discovery measles

   The measles virus is isolated in tissue culture

   Position 12345
5. 5
   Vaccine smallpox

   Edward Jenner sees cowpox protect milkmaids from smallpox: vaccination begins

   Position 12345

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