A Phase 3 Study of Revaccination in Subsequent Pregnancies With Bivalent RSV Vaccine and Duration… (NCT06866405) | Clinical Trial Compass
RecruitingPhase 3
A Phase 3 Study of Revaccination in Subsequent Pregnancies With Bivalent RSV Vaccine and Duration of Protection of a Single Dose
United States, Argentina, South Africa550 participantsStarted 2025-04-16
Plain-language 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.
Who can participate
Age range
0 Years
Sex
ALL
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Pregnant Participants-Cohort 1 and Cohort 2 Key Inclusion Criteria
* Women aged 18 to 49 who are pregnant, between 24 and 36 weeks along, and expecting one baby without known risks for complications can participate.
* Had the RSVpreF or Abrysvo vaccine during a previous pregnancy.
* Had an ultrasound scan at 18 weeks or later during their current pregnancy, with no major fetal problems detected.
* Based on their medical history, physical check-up, and the doctor's judgment, they are found suitable to join the study.
* Agrees to let their baby take part in the study and gives their permission.
* Able to sign a consent form, agreeing to follow the rules and conditions of the study.
Key Exclusion Criteria
* Received any approved or experimental RSV vaccine since their previous pregnancy.
* Has a pre-pregnancy body mass index (BMI) over 40 kg/m2.
* History of a severe bad reaction to a vaccine or a serious allergic reaction (like anaphylaxis) to any ingredient in the study vaccine or a similar vaccine.
* Current pregnancy problems or issues at the time of giving consent.
* Previous pregnancy issues or problems at the time of giving consent.
* Women who are breastfeeding at the time of enrollment
Infant Participants
* Proof that the parent(s) or legal guardian(s) has signed and dated a consent form.
* Parent(s) or legal guardian(s) must agree to attend scheduled visits and follow the study plan, including laboratory tests and other procedures.
Nonpregnant Participants-Cohort…
Questions worth asking your doctor
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
Questions for the trial coordinator
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
What they're measuring
1
Percentage of pregnant participants reporting local reactions
Timeframe: From Day 1 Through at least Day 7 after Vaccination
2
Percentage of pregnant participants reporting systemic events
Timeframe: From Day 1 Through at least Day 7 after Vaccination
3
Percentage of pregnant participants reporting adverse events
Timeframe: From Day 1 through 4 weeks after vaccination
4
Percentage of pregnant participants reporting serious adverse events
Timeframe: From Day 1 throughout the study
5
In infant participants born to pregnant participants receiving a second dose of the study intervention, the percentage of participants reporting adverse events.
Timeframe: From birth through 1 month of age
6
In infant participants born to pregnant participants receiving a second dose of the study intervention, the percentage of participants reporting serious adverse events and newly diagnosed medical conditions.