A Study to Evaluate Safety and Immunogenicity of tOPV in 1 to 5 Years and at 6 Weeks of Age

"Opvero™ (oral) is a trivalent, live attenuated poliomyelitis virus vaccine containing at least 6.0 log 50% cell culture infective dose (CCID50) of LS c2ab strain of live attenuated polio virus type 1, 5.0 log CCID50 of P712, Ch, 2ab strain of live attenuated polio virus type 2, 5.8 log CCID50 Leon I2aIb strain of polio virus type 3. Excipients: human albumin, HEPES buffer solution, magnesium chloride solution (containing polysorbate 80 and phenol red), hydrochloric acid or sodium hydroxide for pH adjustment.~The vaccine is presented as a suspension for oral administration. One dose of vaccine (0.1 ml) is contained in two drops which are delivered from the dropper supplied with the multidose container."