Line for January 20, 2026

Earliest

1. 1
   Campaign smallpox

   WHO launches an intensified plan to eradicate smallpox

   Position 12345
2. 2
   Elimination polio

   The last case of wild polio acquired in the United States

   Position 12345
3. 3
   Campaign Guinea worm

   Guinea worm: about 3.5 million cases a year, the starting line for eradication

   Position 12345
4. 4
   Discovery diphtheria

   The diphtheria bacterium is first seen under the microscope

   Position 12345
5. 5
   Vaccine polio

   The first oral polio vaccines are licensed

   Position 12345

Latest

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