Line for June 12, 2026

Earliest

1. 1
   Discovery diphtheria

   The diphtheria bacterium is first seen under the microscope

   Position 12345
2. 2
   Discovery rotavirus

   Rotavirus is identified as a cause of diarrhea

   Position 12345
3. 3
   Vaccine HPV

   The first HPV vaccine is licensed in the U.S.

   Position 12345
4. 4
   Elimination malaria

   WHO certifies malaria gone from the United States

   Position 12345
5. 5
   Vaccine mumps

   The Jeryl Lynn mumps vaccine is licensed in the U.S.

   Position 12345

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