This Phase 1b will describe the safety and immunogenicity of 2 multivalent pneumococcal conjugate vaccine formulations in healthy Japanese adults in the United States.

Inclusion Criteria:

• Male or female Japanese subjects 18 to 49 years of age, defined as Japanese born in Japan, with both parents and 4 grandparents who wer born in Japan (family tree by history), and who have not lived outside of Japan for more than 5 years total (confirmed by passport or interview)

Exclusion Criteria:

• Participation in other studies involving investigational drug(s), investigational vaccines, or investigational medical devised within 28 days prior to study entry and/or during study participation. Participation in purely observational studies is acceptable.

Pfizer will provide access to individual de-identified participant data and related study documents (e.g. protocol, Statistical Analysis Plan (SAP), Clinical Study Report (CSR)) upon request from qualified researchers, and subject to certain criteria, conditions, and exceptions. Further details on Pfizer's data sharing criteria and process for requesting access can be found at: https://www.pfizer.com/science/clinical\_trials/trial\_data\_and\_results/data\_requests.