Line for April 5, 2026

Earliest

1. 1
   Discovery tuberculosis

   Robert Koch announces the germ that causes tuberculosis

   Position 12345
2. 2
   Campaign tuberculosis

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

   Position 12345
3. 3
   Vaccine smallpox

   Edward Jenner sees cowpox protect milkmaids from smallpox: vaccination begins

   Position 12345
4. 4
   Discovery rubella

   The rubella virus is isolated

   Position 12345
5. 5
   Elimination HIV and syphilis (mother to child)

   Cuba is the first country validated for ending mother-to-child HIV and syphilis

   Position 12345

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