Line for May 14, 2026

Earliest

1. 1
   Campaign smallpox

   WHO launches an intensified plan to eradicate smallpox

   Position 12345
2. 2
   Eradication smallpox

   The World Health Assembly declares the world free of smallpox

   Position 12345
3. 3
   Vaccine rotavirus

   The first rotavirus vaccine is licensed, then withdrawn the next year

   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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