This is a modified single-blind, randomized, parallel-group, comparative, multicenter study to test Menactra vaccine in toddlers. Primary Objectives: * To evaluate the antibody responses induced by Measles, Mumps, Rubella, and Varicella (MMRV) vaccine when administered alone or concomitantly with Menactra vaccine. * To evaluate the antibody responses induced by Pneumococcal Conjugated Vaccine (PCV) when administered alone or concomitantly with Menactra vaccine. Observational Objectives: Safety - To describe the safety profile throughout the course of the study from Day 0 up to 6 months after the last study vaccination\[s\]) in subjects in the study groups. Immunogenicity: \- To describe the antibody responses to meningococcal serogroups A, C, Y, and W-135, 30 days after the first and second Menactra vaccine administration in a subset of subjects in the first study group.
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Measles, Mumps, Rubella, and Varicella (MMRV) Antibody Values in Participants Who Received MMRV Vaccine (Groups 2 and 4 Only)
Timeframe: Day 30 after the 12-month vaccination
Geometric Mean Concentrations (GMCs) of Anti-Pneumococcal Antibodies After Pneumococcal Conjugated Vaccine (PCV) in Groups 3 and 4
Timeframe: Day 30 after the 12-month vaccination