Inactivated polio vaccines from three different manufacturers have equivalent safety and immunogenicity when given as 1 or 2 additional doses after bivalent OPV: Results from a randomized controlled trial in Latin America.
Lopez-Medina E, Melgar M, Gaensbauer JT, Bandyopadhyay AS, Borate BR, Weldon WC, R?ttimann R, Ward J, Clemens R, Asturias EJ. Inactivated polio vaccines from three different manufacturers have equivalent safety and immunogenicity when given as 1 or 2 additional doses after bivalent OPV: Results from a randomized controlled trial in Latin America. Vaccine. 2017 06 16; 35(28):3591-3597.