Line for February 15, 2026

Earliest

1. 1
   Elimination rubella

   Endemic rubella is declared eliminated in the United States

   Position 12345
2. 2
   Discovery tetanus

   Kitasato isolates the tetanus organism from a patient

   Position 12345
3. 3
   Discovery tuberculosis

   Robert Koch announces the germ that causes tuberculosis

   Position 12345
4. 4
   Discovery rubella

   Rubella is described as a disease of its own ("German measles")

   Position 12345
5. 5
   Vaccine hepatitis B

   The first hepatitis B vaccine is licensed in the U.S.

   Position 12345

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