Line for July 22, 2026

Earliest

1. 1
   Discovery hepatitis B

   The hepatitis B surface antigen is first described

   Position 12345
2. 2
   Vaccine malaria

   WHO recommends the first malaria vaccine for wide use in children

   Position 12345
3. 3
   Discovery measles

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

   Position 12345
4. 4
   Campaign polio

   The World Health Assembly resolves to eradicate polio

   Position 12345
5. 5
   Elimination HIV and syphilis (mother to child)

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

   Position 12345

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