Line for February 6, 2026

Earliest

1. 1
   Discovery measles

   The measles virus is isolated in tissue culture

   Position 12345
2. 2
   Vaccine rotavirus

   The first rotavirus vaccine is licensed, then withdrawn the next year

   Position 12345
3. 3
   Vaccine hepatitis A

   The first hepatitis A vaccines are licensed in the U.S.

   Position 12345
4. 4
   Elimination polio

   The WHO African Region is certified free of wild polio

   Position 12345
5. 5
   Eradication rinderpest (a cattle disease)

   The last identified case of rinderpest, the second disease ever eradicated

   Position 12345

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