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.
Age range
9 Months – 12 Months
Sex
ALL
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The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
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