Line for April 16, 2026

Earliest

1. 1
   Elimination malaria

   WHO certifies malaria gone from the United States

   Position 12345
2. 2
   Campaign measles

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

   Position 12345
3. 3
   Discovery measles

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

   Position 12345
4. 4
   Treatment bacterial infections

   A Nobel Prize for penicillin "and its curative effect"

   Position 12345
5. 5
   Discovery diphtheria

   The diphtheria bacterium is first seen under the microscope

   Position 12345

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