A Study to Evaluate the Safety and Immunogenicity of Novel Oral Polio Vaccine

This will be a single center, age de-escalation, partly-blinded, randomized study. The trial will be performed with the participation of 100 healthy children age 1-5 years who have been vaccinated with inactivated polio vaccine (IPV) and/or oral polio vaccine (OPV) in their first year of life and of 648 healthy 6 week-old infants, who will be pre-vaccinated with bOPV-IPV before being randomized to study groups. The allocation of 18-22 week-old infants to groups will be performed in a randomized manner. Following completion and Data Safety Monitoring Board (DSMB) review of follow-up for general safety data (Serioius Adverse Events -SAEs-, Important Medical Events -IMEs- and severe adverse events -AEs), a DSMB recommendation to proceed will result in randomization of the final cohort of infants. Allocation of 1 to 5 year-old children to groups will be performed in a randomized manner. The DSMB will establish and continuously assess stopping rules for safety.