Line for February 7, 2026

Earliest

1. 1
   Vaccine pertussis

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

   Position 12345
2. 2
   Discovery hepatitis B

   The hepatitis B surface antigen is first described

   Position 12345
3. 3
   Treatment hepatitis C

   Treatments that can cure hepatitis C become available

   Position 12345
4. 4
   Vaccine rotavirus

   The first rotavirus vaccine is licensed, then withdrawn the next year

   Position 12345
5. 5
   Campaign measles

   Measles becomes a disease U.S. doctors and labs must report

   Position 12345

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