Line for May 15, 2026

Earliest

1. 1
   Campaign tuberculosis

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

   Position 12345
2. 2
   Discovery diphtheria

   The diphtheria bacterium is first seen under the microscope

   Position 12345
3. 3
   Vaccine chickenpox

   The chickenpox (varicella) vaccine is licensed in the U.S.

   Position 12345
4. 4
   Vaccine pneumococcal disease

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

   Position 12345
5. 5
   Vaccine rotavirus

   The first rotavirus vaccine is licensed, then withdrawn the next year

   Position 12345

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