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This study tests a new oral polio vaccine (nOPV3) in healthy young children, infants, and newborns to see if it is safe and triggers a strong immune response. About 1,500 participants in Panama will receive either the new vaccine or an existing one. The goal is to find a safer an…

This study tests a new oral polio vaccine (nOPV1) in over 2,200 healthy children, infants, and newborns in Bangladesh. The goal is to see if it is safe and triggers a strong immune response compared to the current vaccine. Participants will receive up to three doses and be monito…

This study tests whether giving two new oral polio vaccines together is safe and works as well as giving them separately in healthy 16-week-old infants. About 675 babies in Panama will receive either the combined or single vaccines. The goal is to see if the combined approach can…