Line for April 19, 2026

Earliest

1. 1
   Eradication smallpox

   The last known natural smallpox case, in Somalia

   Position 12345
2. 2
   Campaign polio

   The World Health Assembly resolves to eradicate polio

   Position 12345
3. 3
   Discovery hepatitis B

   The hepatitis B surface antigen is first described

   Position 12345
4. 4
   Discovery rubella

   The rubella virus is isolated

   Position 12345
5. 5
   Vaccine Hib disease

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

   Position 12345

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