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A Phase 3, Randomized, Modified Double-blind, Active-controlled, Parallel-group, Lot-to-lot Consistency, 4-arm Study to Investigate the Safety and Immunogenicity of a 4-dose Regimen of a 21-valent Pneumococcal Conjugate Vaccine in Healthy Infants and Toddlers

This is a phase 3 randomized, modified double-blind study whose purpose is to measure whether 3 lots of the investigational pneumococcal vaccine PCV21 can help…