Line for February 17, 2026

Earliest

1. 1
   Vaccine smallpox

   Edward Jenner sees cowpox protect milkmaids from smallpox: vaccination begins

   Position 12345
2. 2
   Campaign tuberculosis

   March 24 is recognized as World TB Day, a century after Koch

   Position 12345
3. 3
   Discovery diphtheria

   The diphtheria bacterium is first seen under the microscope

   Position 12345
4. 4
   Vaccine measles

   An improved, weaker measles vaccine goes into use

   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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