Line for January 16, 2026

Earliest

1. 1
   Discovery diphtheria

   The diphtheria bacterium is first seen under the microscope

   Position 12345
2. 2
   Vaccine hepatitis B

   The first hepatitis B vaccine is licensed in the U.S.

   Position 12345
3. 3
   Discovery tuberculosis

   Robert Koch announces the germ that causes tuberculosis

   Position 12345
4. 4
   Vaccine measles

   An improved, weaker measles vaccine goes into use

   Position 12345
5. 5
   Vaccine measles

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

   Position 12345

Latest

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