Line for March 31, 2026

Earliest

1. 1
   Vaccine Hib disease

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

   Position 12345
2. 2
   Campaign smallpox

   WHO launches an intensified plan to eradicate smallpox

   Position 12345
3. 3
   Vaccine measles, mumps, rubella, chickenpox

   The combined MMRV vaccine is licensed

   Position 12345
4. 4
   Treatment hepatitis C

   Treatments that can cure hepatitis C become available

   Position 12345
5. 5
   Discovery measles

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

   Position 12345

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