Line for August 29, 2026

Earliest

1. 1
   Vaccine measles, mumps, rubella

   The combined MMR vaccine is licensed

   Position 12345
2. 2
   Campaign Guinea worm

   Guinea worm: about 3.5 million cases a year, the starting line for eradication

   Position 12345
3. 3
   Vaccine hepatitis B

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

   Position 12345
4. 4
   Discovery measles

   The measles virus is isolated in tissue culture

   Position 12345
5. 5
   Discovery rotavirus

   Rotavirus is identified as a cause of diarrhea

   Position 12345

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