The purpose of this study is to evaluate the immunogenicity and safety of 13-valent pneumococcal polysaccharide vaccine when given concomitantly with seasonal inactivated influenza vaccine to adults 50 years and older who have previously received 23-valent pneumococcal polysaccharide vaccine.

Concomitant Administration of 13-valent Pneumococcal Conjugate Vaccine (13vPnC) With Influenza Vaccine in 23-valent Pneumococcal Polysaccharide (23vPS) Pre-vaccinated Adults.

A Phase 4, Randomized, Double-blind Trial To Evaluate The Immunogenicity And Safety Of A 13-valent Pneumococcal Conjugate Vaccine When Administered Concomitantly With Seasonal Inactivated Influenza Vaccine In Adults 50 Years And Older Who Received 1 Or More Doses Of 23-valent Pneumococcal Polysaccharide Vaccine Prior To Study Enrollment.

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Concomitant Administration of 13-valent Pneumococcal Conjugate Vaccine (13vPnC) With Influenza Vaccine in 23-valent Pneumococcal Polysaccharide (23vPS) Pre-vaccinated Adults.

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