Line for January 26, 2026

Earliest

1. 1
   Eradication smallpox

   The last known natural smallpox case, in Somalia

   Position 12345
2. 2
   Elimination polio

   The last case of wild polio acquired in the United States

   Position 12345
3. 3
   Discovery tetanus

   Kitasato isolates the tetanus organism from a patient

   Position 12345
4. 4
   Discovery measles

   The measles virus is isolated in tissue culture

   Position 12345
5. 5
   Vaccine polio

   The inactivated polio vaccine (IPV) is licensed

   Position 12345

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