Line for April 29, 2026

Earliest

1. 1
   Discovery measles

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

   Position 12345
2. 2
   Discovery rotavirus

   Rotavirus is identified as a cause of diarrhea

   Position 12345
3. 3
   Discovery tuberculosis

   Robert Koch announces the germ that causes tuberculosis

   Position 12345
4. 4
   Campaign smallpox

   WHO launches an intensified plan to eradicate smallpox

   Position 12345
5. 5
   Campaign smallpox

   WHO starts a plan to rid the world of smallpox

   Position 12345

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