Safety, Immunogenicity and Lot Comparability of DAPTACEL™ (Aventis Pasteur Classic Five-component Pertussis Vaccine in Combination With Tetanus and Diphtheria Toxoids Adsorbed) When Administered With Other Recommended Vaccines at 2, 4, 6, and 15 to 16 Months of Age.

This study was designed to assess the lot comparability of DAPTACEL, as well as the safety and immunogenicity of DAPTACEL when co-administered with other recommended infant vaccines.

Stage I Primary Objectives:

1. To assess the lot-comparability of immunogenicity of DAPTACEL by when co-administered with other recommended vaccines.
2. To compare the immune response to DTaP-IPV/Hib (Pentacel) with those of three lots of DAPTACEL when co-administered with other recommended vaccines.
3. To compare the immune response of PRP-T antigen in Pentacel with that of ActHIB concurrently administered in a different injection site with DAPTACEL when these vaccines are co-administered with other recommended vaccines.

Stage II Primary Objectives:

1. To compare the immune response of DAPTACEL when the 4th dose is co-administered with Hib or other infant vaccines.
2. To compare the the immune response of Pentacel with those elicited by DAPTACEL when co-administered with ActHIB in toddlers.