Line for July 3, 2026

Earliest

1. 1
   Elimination smallpox

   Smallpox is eliminated in North America

   Position 12345
2. 2
   Discovery measles

   A Scottish physician shows measles is caused by an infectious agent in the blood

   Position 12345
3. 3
   Elimination malaria

   WHO certifies malaria gone from the United States

   Position 12345
4. 4
   Vaccine polio

   The inactivated polio vaccine (IPV) is licensed

   Position 12345
5. 5
   Discovery measles

   The measles virus is isolated in tissue culture

   Position 12345

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