<prompt> OPV Bivalent vaccine contain:P1 P2PI P3P2 P3P1, P2 P3  <response>: b. P1 P3Ref: Nelsons 20e p 1561, 3212, Ghai 8e p 190-194Monovalent OPVs mOPVs bivalent OPV bOPV are 2.5-3 times more efficacious than trivalent OPVIn bivalent OPV, the type 2 component is removed 