Line for April 12, 2026

Earliest

1. 1
   Discovery measles

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

   Position 12345
2. 2
   Vaccine Hib disease

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

   Position 12345
3. 3
   Vaccine pertussis

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

   Position 12345
4. 4
   Discovery diphtheria

   The diphtheria bacterium is first seen under the microscope

   Position 12345
5. 5
   Vaccine measles

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

   Position 12345

Latest

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