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This study is testing a new oral polio vaccine (nOPV1) to see if it is safe and triggers a good immune response. It will involve over 2,200 healthy newborns, infants, and young children in Bangladesh. Researchers will compare the new vaccine to an existing one, checking for side …

This study is testing whether giving two new types of oral polio vaccine together is as safe and effective as giving them separately to healthy infants. It involves 675 babies in Panama who will receive three doses of either the single or combined vaccines starting at 16 weeks ol…