Line for September 21, 2026

Earliest

1. 1
   Elimination polio

   The WHO African Region is certified free of wild polio

   Position 12345
2. 2
   Discovery hepatitis B

   The hepatitis B surface antigen is first described

   Position 12345
3. 3
   Elimination rubella

   Endemic rubella is declared eliminated in the United States

   Position 12345
4. 4
   Campaign tuberculosis

   March 24 is recognized as World TB Day, a century after Koch

   Position 12345
5. 5
   Vaccine measles, mumps, rubella, chickenpox

   The combined MMRV vaccine is licensed

   Position 12345

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