Line for June 16, 2026

Earliest

1. 1
   Elimination measles

   Measles is declared eliminated from the United States

   Position 12345
2. 2
   Vaccine tetanus

   Tetanus toxoid is developed

   Position 12345
3. 3
   Vaccine measles

   An improved, weaker measles vaccine goes into use

   Position 12345
4. 4
   Discovery diphtheria

   The diphtheria bacterium is first seen under the microscope

   Position 12345
5. 5
   Campaign Guinea worm

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

   Position 12345

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