Line for March 30, 2026

Earliest

1. 1
   Vaccine smallpox

   Edward Jenner sees cowpox protect milkmaids from smallpox: vaccination begins

   Position 12345
2. 2
   Discovery measles

   A Scottish physician shows measles is caused by an infectious agent in the blood

   Position 12345
3. 3
   Vaccine measles

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

   Position 12345
4. 4
   Elimination malaria

   WHO certifies malaria gone from the United States

   Position 12345
5. 5
   Vaccine pertussis

   The first whole-cell whooping cough (pertussis) vaccines are licensed in the U.S.

   Position 12345

Latest

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