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Study identifier: NCT07573462 Synced from ClinicalTrials.gov · July 29, 2026
● Recruiting

A Study to Learn About the Safety of an Expanded Pneumococcal Vaccine in Healthy Infants

Condition: Pneumococcal Disease  ·  Sponsor: Pfizer

PhasePhase 3
Planned participants2400
Who can joinAll sexes, 42 Days to 98 Days
Healthy volunteersYes

About this study

The purpose of this study is to learn about the safety of a new pneumococcal vaccine and how the new pneumococcal vaccine helps to fight against germs that can cause pneumonia (lung infections), meningitis (brain infections), and otitis media (ear infections) in infants when compared to the pneumococcal vaccine that is currently in use, 20vPnC (Prevnar 20®). This study will test if the new pneumococcal vaccine is as safe as the one that is currently in use. This new vaccine can possibly provide additional protection against germs that cause pneumococcal disease that are not included in the vaccines that are currently given to infants. Pneumococcal disease includes a variety of infections caused by a specific germ, Streptococcus pneumoniae. There are two groups in this study. All participants will be assigned to one of the two groups. This study is seeking participants who are: \- infants who are about 2 months of age About 2400 infants will be assigned by chance to one of the two groups to receive either PG4 (new vaccine) or 20vPnC (currently in use) into the left thigh muscle at 2, 4, 6, and 12 to 15 months of age. Infants will take part in this study for about 16 to 19 months (about 1 and a half years). During this time, infants will have 6 study clinic visits and 1 phone call. At these study clinic visits, parent(s)/legal guardian(s) will be asked if the infant experienced any side effects. A side effect is an unintentional or unexpected reaction to a vaccine.

This description comes directly from the study's public registry record.

Talk to the study team

Pfizer CT.gov Call Center  ·  1-800-718-1021  ·  ClinicalTrials.gov_Inquiries@pfizer.com

Always discuss trial participation with your own doctor first.

Locations (21)

Starz PediatricsEstero, Florida, United StatesRecruiting
Innovate Research Centers, LLCFort Lauderdale, Florida, United StatesRecruiting
MacKoul Pediatrics Fort MyersFort Myers, Florida, United StatesRecruiting
Rophe Adult and Pediatric Medicine/SKYCRNGUnion City, Georgia, United StatesRecruiting
Rosemark Women Care SpecialistsIdaho Falls, Idaho, United StatesRecruiting
Eagle Clinical ResearchChicago, Illinois, United StatesNot Yet Recruiting
Kentucky Pediatric/ Adult ResearchBardstown, Kentucky, United StatesRecruiting
LSU Health Shreveport Clinical Trials OfficeShreveport, Louisiana, United StatesRecruiting
Ochsner/LSU Health Shreveport - Progressive PediatricsShreveport, Louisiana, United StatesRecruiting
Ochsner LSU Health Shreveport Ambulatory Care CenterShreveport, Louisiana, United StatesRecruiting
Ochsner/LSU Health Shreveport Academic Medical CenterShreveport, Louisiana, United StatesRecruiting
Pediatric Associates of Fall RiverFall River, Massachusetts, United StatesNot Yet Recruiting

+ 9 more locations — full list on the registry record.

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Source record: clinicaltrials.gov/study/NCT07573462