Line for October 22, 2026

Earliest

1. 1
   Discovery rubella

   The rubella virus is isolated

   Position 12345
2. 2
   Vaccine polio

   The first oral polio vaccines are licensed

   Position 12345
3. 3
   Discovery tetanus

   Kitasato isolates the tetanus organism from a patient

   Position 12345
4. 4
   Vaccine polio

   The inactivated polio vaccine (IPV) is licensed

   Position 12345
5. 5
   Elimination polio

   The WHO African Region is certified free of wild polio

   Position 12345

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