Line for October 9, 2026

Earliest

1. 1
   Discovery diphtheria

   The diphtheria bacterium is first seen under the microscope

   Position 12345
2. 2
   Discovery tuberculosis

   Robert Koch announces the germ that causes tuberculosis

   Position 12345
3. 3
   Campaign smallpox

   WHO starts a plan to rid the world of smallpox

   Position 12345
4. 4
   Campaign measles

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

   Position 12345
5. 5
   Eradication rinderpest (a cattle disease)

   The last identified case of rinderpest, the second disease ever eradicated

   Position 12345

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