Line for April 30, 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 measles

   An improved, weaker measles vaccine goes into use

   Position 12345
3. 3
   Vaccine hepatitis B

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

   Position 12345
4. 4
   Vaccine rotavirus

   The first rotavirus vaccine is licensed, then withdrawn the next year

   Position 12345
5. 5
   Discovery measles

   The measles virus is isolated in tissue culture

   Position 12345

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