Line for July 27, 2026

Earliest

1. 1
   Elimination smallpox

   Smallpox is eliminated in North America

   Position 12345
2. 2
   Discovery hepatitis B

   The hepatitis B surface antigen is first described

   Position 12345
3. 3
   Vaccine malaria

   WHO recommends the first malaria vaccine for wide use in children

   Position 12345
4. 4
   Eradication smallpox

   The last known natural smallpox case, in Somalia

   Position 12345
5. 5
   Vaccine chickenpox

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

   Position 12345

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