This Phase 1, randomized, double-blind, third-party-unblinded study will be conducted at investigational sites in China. The purpose of the study is to learn about the safety and immune response of 20vPnC and 13vPnC in Chinese adults 50 years of age and older who did not receive any of pneumococcal vaccine in the past
Protocol Amendment History
5 amendments
This ClinicalTrials.gov record has been amended 5 times since 2025-06-05; most recent amendment 2026-02-23.
Status change: Active, Not Recruiting → Completed2026-02-23
Status change: Recruiting → Active, Not Recruiting2025-08-12
Status change: Not Yet Recruiting → Recruiting2025-07-22