A Phase II, single-blind, randomized, controlled study to evaluate the immunogenicity and safety of a measles, mumps, rubella, varicella vaccine compared with ProQuad, administered in healthy children 4 to 6 years of age

This study will evaluate the immune response to the MMRVNS vaccines (formulated with different potencies) and the MMRV vaccine (pooled group) in terms of GMCs for antibodies to measles, mumps, rubella, and varicella viruses.

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