Line for May 26, 2026

Earliest

1. 1
   Campaign measles

   Measles becomes a disease U.S. doctors and labs must report

   Position 12345
2. 2
   Discovery rubella

   The rubella virus is isolated

   Position 12345
3. 3
   Eradication smallpox

   The World Health Assembly declares the world free of smallpox

   Position 12345
4. 4
   Discovery measles

   The measles virus is isolated in tissue culture

   Position 12345
5. 5
   Treatment bacterial infections

   A Nobel Prize for penicillin "and its curative effect"

   Position 12345

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