Study of DTap-IPV Compared to DAPTACEL® and IPOL® as the 5th Dose in Children 4 to 6 Years of Age

The study was designed to compare the safety and immunogenicity of DTap-IPV with DAPTACEL® + IPOL® as the 5th dose booster in children ≥ 4 to \< 7 years of age in the US and Puerto Rico who were previously vaccinated with DAPTACEL® and/or Pentacel® vaccines only. Primary Objectives: * To compare the pertussis \[Pertussis Toxoid (PT), Filamentous Haemagglutinin (FHA), Pertactin (PRN), and Fimbriae Types 2 and 3 (FIM)\] booster responses and geometric mean concentrations (GMCs) (as measured by enzyme-linked immunosorbent assay \[ELISA\]) following DTap-IPV vaccination to those elicited following DAPTACEL® + IPOL® vaccination when administered as a 5th dose. * To compare the diphtheria and tetanus booster responses and GMCs (as measured by ELISA) following DTap-IPV vaccination with those elicited following DAPTACEL® + IPOL® vaccinations when administered as a 5th dose . * To compare the Inactivated Poliovirus Vaccine booster responses (as measured by neutralizing assay) following DTap-IPV vaccination with those elicited following DAPTACEL® + IPOL® vaccinations. Observational Objectives: * To compare the polio (types 1, 2, and 3) geometric mean titers (GMTs) following DTap-IPV vaccination with those elicited following DAPTACEL® + IPOL® vaccinations. * To assess the safety of DTap-IPV vaccine or DAPTACEL® + IPOL® vaccine when administered as the fifth dose booster vaccine in participants previously vaccinated with DAPTACEL and/or Pentacel vaccines.

All participants will be randomized to receive either one dose each of DTap-IPV + Measles, Mumps, and Rubella Virus Vaccine Live (M-M-R®II) + VARIVAX® or one dose each of DAPTACEL® + IPOL® + M-M-R®II + VARIVAX® on Day 0.