Line for May 6, 2026

Earliest

1. 1
   Discovery measles

   The measles virus is isolated in tissue culture

   Position 12345
2. 2
   Eradication smallpox

   The World Health Assembly declares the world free of smallpox

   Position 12345
3. 3
   Vaccine hepatitis B

   The first hepatitis B vaccine is licensed in the U.S.

   Position 12345
4. 4
   Campaign measles

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

   Position 12345
5. 5
   Campaign tuberculosis

   March 24 is recognized as World TB Day, a century after Koch

   Position 12345

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