Clinical Trial

A Phase 3 Study of Revaccination in Subsequent Pregnancies With Bivalent RSV Vaccine and Duration of Protection of a Single Dose

Recruiting Phase 3
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Summary
This study aims to check how safe and well-tolerated a second dose of RSVpreF is when given during later pregnancies, and to see how long the immunity lasts from a single dose given during a previous pregnancy by examining the blood of nonpregnant participants who had the vaccine before.
Protocol Amendment History 25 amendments
This ClinicalTrials.gov record has been amended 25 times since 2025-03-04; most recent amendment 2026-07-07.
Status change: Not Yet Recruiting → Recruiting 2025-04-30
Trial Details
NCT Number NCT06866405
Lead Sponsor Pfizer
Conditions RSV Infection
Enrollment 550 participants
Start Date 2025-04-16
Primary Completion 2028-02-24 (estimated)
Study Completion 2028-02-24 (estimated)
Updated on ClinicalTrials.gov 2026-08-14