Line for September 2, 2026

Earliest

1. 1
   Campaign measles

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

   Position 12345
2. 2
   Discovery hepatitis B

   The hepatitis B surface antigen is first described

   Position 12345
3. 3
   Vaccine hepatitis A

   The first hepatitis A 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 pneumococcal disease

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

   Position 12345

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