Line for May 12, 2026

Earliest

1. 1
   Elimination HIV and syphilis (mother to child)

   Cuba is the first country validated for ending mother-to-child HIV and syphilis

   Position 12345
2. 2
   Discovery measles

   The measles virus is isolated in tissue culture

   Position 12345
3. 3
   Campaign tuberculosis

   March 24 is recognized as World TB Day, a century after Koch

   Position 12345
4. 4
   Discovery hepatitis B

   The hepatitis B surface antigen is first described

   Position 12345
5. 5
   Vaccine measles

   An improved, weaker measles vaccine goes into use

   Position 12345

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