A Study to Learn About How a New Pneumococcal Vaccine Works in Children
← catalyst calendarSponsored by Pfizer (industry) · PFE — their whole pipeline →.
Phase
Phase 2
Status
Completed
Study type
Interventional
Design
Randomized · Triple · Prevention
Enrollment
225actual
Sites
39
Countries
Puerto Rico, United States
Every value on this page is a field the sponsor filed with ClinicalTrials.gov, reproduced. Dates are their own estimates, revised as a study runs, unless the registry marks them actual. sources →
Source: ClinicalTrials.gov, retrieved 2026-08-19
Dates
each axis at the precision it was filed, with the registry's own basis| Date | Filed | Basis | What it is |
|---|---|---|---|
| Start | 2024-07-30 | actual | When the study began enrolling |
| Primary completion | 2026-02-09 | actual | The date the last participant is measured for the primary outcome — the readout window |
| Study completion | 2026-02-09 | actual | The whole study's end, after follow-up |
| First posted | 2024-08-01 | actual | When this record first appeared on the registry |
| Results posted | — | When the sponsor posted results to the registry | |
| Record updated | 2026-03-11 | actual | The sponsor's own last edit to this record — every projection above is as current as this date |
What it studies
Condition
- Pneumococcal Disease
Interventions
- Biological: PG4
- Biological: 20-valent pneumococcal conjugate vaccine (20vPnC) — also filed as Prevnar 20
Primary outcomes
what the primary-completion date above is the date OFPercentage of participants reporting prespecified local reactions within 7 days after each dose
measured 7 days after each dose
Percentage of participants reporting prespecified systemic events within 7 days after each dose
measured 7 days after each dose
Percentage of participants reporting Adverse Events (AEs) within 1 month after the last assigned vaccination
measured From signing of ICD to 1 month after last assigned vaccination
Percentage of participants reporting Serious Adverse Events (SAEs) within 6 months after vaccination
measured From signing of ICD to 6 months after last assigned vaccination
Permalink · PFE's whole pipeline · Catalyst calendar · Every registered study · What changed