Line for September 7, 2026

Earliest

1. 1
   Campaign Guinea worm

   Guinea worm is down to 14 human cases in a year

   Position 12345
2. 2
   Vaccine polio

   The first oral polio vaccines are licensed

   Position 12345
3. 3
   Vaccine smallpox

   Edward Jenner sees cowpox protect milkmaids from smallpox: vaccination begins

   Position 12345
4. 4
   Discovery hepatitis B

   The hepatitis B surface antigen is first described

   Position 12345
5. 5
   Vaccine measles

   The first live measles vaccine is licensed in the U.S.

   Position 12345

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