Line for August 13, 2026

Earliest

1. 1
   Discovery measles

   The measles virus is isolated in tissue culture

   Position 12345
2. 2
   Discovery diphtheria

   The diphtheria bacterium is first seen under the microscope

   Position 12345
3. 3
   Vaccine malaria

   WHO recommends the first malaria vaccine for wide use in children

   Position 12345
4. 4
   Vaccine measles

   An improved, weaker measles vaccine goes into use

   Position 12345
5. 5
   Vaccine pertussis

   The first whole-cell whooping cough (pertussis) vaccines are licensed in the U.S.

   Position 12345

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