A Study to Learn About the Safety and Immune Response of 20vPnC in Adults in India.

An AE was any untoward medical occurrence in a participant or clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. Only AEs collected by non-systematic assessment (i.e. excluding local reactions and systemic events) were reported in this outcome measure. Exact 2-sided 95% confidence interval was based on the Clopper and Pearson method.

Time frame: From vaccination on Day 1 up to 1 Month after vaccination

Population: Safety population included all participants who received any study intervention and had safety data assessed after vaccination.

Local reactions (redness, swelling, and injection site pain) at the site of investigational product administration were recorded in electronic diary (e-diary). Redness and swelling were measured and recorded in caliper units where 1 caliper unit = 0.5 centimeter (cm). Redness and swelling were graded as mild (more than \[\>\]2.0 to 5.0 cm), moderate (\>5.0 to 10.0cm) and severe (\>10.0cm). Pain at injection site was graded as mild (did not interfere with activity), moderate (interfered with activity), and severe (prevented daily activity). Exact 2-sided 95% confidence interval was based on the Clopper and Pearson method.

Time frame: Day 1 to Day 7 after vaccination

Population: Safety population included all participants who received any study intervention and had safety data assessed after vaccination.

An SAE was any untoward medical occurrence at any dose that: resulted in death, was life threatening, required inpatient hospitalization or prolongation of existing hospitalization, resulted in persistent or significant disability/incapacity, resulted in congenital anomaly/birth defect or was a suspected transmission via a Pfizer product of an infectious agent, pathogenic or non-pathogenic or that was considered to be an important medical event.

Time frame: From vaccination on Day 1 up to 1 Month after vaccination

Population: Safety population included all participants who received any study intervention and had safety data assessed after vaccination.

Systemic events included: fever, fatigue, headache, joint pain and muscle pain. Fever was defined as an oral temperature of more than or equal to (\>=)38.0 degree Celsius (C) and was classified as \>=38.0 degree C, \>=38.0 to 38.4 degree C, \>38.4 to 38.9 degree C, \>38.9 to 40.0 degree C and \>40.0 degree C. Fatigue, headache, joint pain and muscle pain were graded as mild (did not interfere with activity), moderate (some interference with activity) and severe (prevented daily activity). Exact 2-sided 95% confidence interval was based on the Clopper and Pearson method.

Time frame: Day 1 to Day 7 after vaccination

Population: Safety population included all participants who received any study intervention and had safety data assessed after vaccination.

GMFRs and 2-sided 95% confidence interval (CIs) were calculated by exponentiating the mean logarithm of fold rises and the corresponding CIs (based on the Student t distribution). Assay results below the lower limit of quantification (LLOQ) were set to 0.5\*LLOQ in the analysis. Evaluable immunogenicity population: Eligible participants in the immunogenicity subset who received 1 dose of the intervention with at least 1 valid immunogenicity result from the blood sample collection within 27 to 49 days after vaccination, had no other major protocol deviations as determined by the clinician.

Time frame: From before vaccination to 1 Month after vaccination

Population: Evaluable immunogenicity population evaluated. Number of participants analyzed= Number of participants in evaluable immunogenicity population. Number Analyzed = Number of evaluable participants with valid OPA titers for the specified serotype both before and after vaccination.