Line for January 18, 2026

Earliest

1. 1
   Vaccine pneumococcal disease

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

   Position 12345
2. 2
   Discovery diphtheria

   The diphtheria bacterium is first seen under the microscope

   Position 12345
3. 3
   Vaccine smallpox

   Edward Jenner sees cowpox protect milkmaids from smallpox: vaccination begins

   Position 12345
4. 4
   Discovery tuberculosis

   Robert Koch announces the germ that causes tuberculosis

   Position 12345
5. 5
   Vaccine polio

   The inactivated polio vaccine (IPV) is licensed

   Position 12345

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