PCV21 vaccine is named as an intervention in 3 current clinical trials in our USA register. 1 is recruiting patients now. All registered phases are Phase 3. The sponsor with the most trials is Sanofi (2). The most-studied condition is Pneumococcal Immunization.
| Study | Phase | Status | Lead sponsor | Registers |
|---|---|---|---|---|
|
Lot-to-lot Consistency Study of a 21-valent Pneumococcal Conjugate Vaccine in Healthy Infants From 2 Months of Age
NCT07348692 · ClinicalTrials.gov ↗ · Pneumococcal Immunization, Healthy Volunteers
|
Phase 3 | Recruiting | Sanofi | USA |
|
Study of a 4-Dose Regimen of a 21-valent Pneumococcal Conjugate Vaccine in Healthy Infants From Approximately 2 Months of Age
NCT06736041 · ClinicalTrials.gov ↗ · Pneumococcal Immunization
|
Phase 3 | Active, closed | Sanofi Pasteur, a Sanofi Company | USA |
|
Study of Mixed Vaccination Schedules With a 21-valent Pneumococcal Conjugate Vaccine and a 20-valent Pneumococcal Conjugate Vaccine in Healthy Infants From Approximately 2 Months of Age
NCT06824181 · ClinicalTrials.gov ↗ · Pneumococcal Immunization
|
Phase 3 | Active, closed | Sanofi | USA |
Registers list studies that are recruiting, about to open, active but closed to enrolment, or enrolling by invitation. The UK and USA registers cover industry-sponsored studies only. Trial titles and statuses are copied from the registry as published.
| Lead sponsor | Trials |
|---|---|
| Sanofi | 2 |
| Sanofi Pasteur, a Sanofi Company | 1 |
| Register | Trials | Recruiting |
|---|---|---|
| Clinical trials in USA | 3 | 1 |
A trial with sites in more than one country appears in each of those registers.
3 current trials in our USA register name PCV21 vaccine as a drug or biological intervention, as of the registry sync on 25 September 2026. Completed and withdrawn studies are not counted.
Yes. 1 of the 3 trials is recruiting: 1 with sites in USA. Eligibility and site contacts are on each trial's record. Only the study team can confirm whether a patient is eligible.
Sanofi (2) and Sanofi Pasteur, a Sanofi Company (1). The number in brackets is how many trials each organisation leads.
Every trial, status, phase and sponsor on this page is copied from public ClinicalTrials.gov records by a daily sync. Nothing here describes how PCV21 vaccine works or whether it is effective, and it is not medical advice.
Everything on this page is copied from public ClinicalTrials.gov registry records — it is not written from memory, and nothing here describes how PCV21 vaccine works or whether it is effective. Each trial links to its own record so you can check it yourself.
This page is built automatically: a daily sync job reads the registry records behind our country trial registers, collects every trial that lists PCV21 vaccine (or a registered synonym) as a drug or biological intervention, and tabulates the registry fields directly. Placebos and generic comparators are excluded. There is no AI drafting and no per-compound editorial pass, and the page has not been clinically reviewed. The “last verified” date above is the timestamp of that sync, not a review date. Our general editorial approach is described in our editorial standards and corrections policy. The ClinicalTrials.gov data on this page was last retrieved on 25 Sep 2026.