Actively Recruiting
A Phase 3 Study of Revaccination in Subsequent Pregnancies With Bivalent RSV Vaccine and Duration of Protection of a Single Dose
Led by Pfizer · Updated on 2026-05-05
550
Participants Needed
94
Research Sites
149 weeks
Total Duration
On this page
AI-Summary
What this Trial Is About
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.
CONDITIONS
Official Title
A Phase 3 Study of Revaccination in Subsequent Pregnancies With Bivalent RSV Vaccine and Duration of Protection of a Single Dose
Who Can Participate
Eligibility Criteria
You may qualify if you...
- Women aged 18 to 49 who are pregnant between 24 and 36 weeks expecting one baby without known risks
- Received RSVpreF or Abrysvo vaccine during a previous pregnancy
- Had an ultrasound at 18 weeks or later in the current pregnancy showing no major fetal problems
- Medically suitable to join based on history, exam, and doctor judgment
- Agree to let their baby participate and provide permission
- Able to sign consent agreeing to study rules
- Parent or guardian consent for infant participation
- Parent or guardian agrees to attend visits and follow study plans including tests
- Nonpregnant participants who had one dose of RSVpreF in a previous Pfizer trial with available results
- Able to sign consent and follow study requirements
You will not qualify if you...
- Received any approved or experimental RSV vaccine since previous pregnancy
- Pre-pregnancy BMI over 40 kg/m2
- History of severe vaccine or allergic reactions to study vaccine or similar
- Current pregnancy problems at consent time
- Previous pregnancy problems at consent time
- Breastfeeding at enrollment
- Received any approved or experimental RSV vaccine after the Pfizer trial (nonpregnant cohort)
- Participating in other drug studies within 28 days before consent or during study
AI-Screening
AI-Powered Screening
Complete this quick 3-step screening to check your eligibility
Trial Site Locations
Total: 94 locations
1
Center for Research in Women's Health
Birmingham, Alabama, United States, 35233
Actively Recruiting
2
Children's of Alabama
Birmingham, Alabama, United States, 35233
Actively Recruiting
3
University of Alabama at Birmingham - School of Medicine
Birmingham, Alabama, United States, 35233
Actively Recruiting
4
University of Alabama at Birmingham Women & Infants Center
Birmingham, Alabama, United States, 35233
Actively Recruiting
5
USA Health Children's and Women's Hospital
Mobile, Alabama, United States, 36604
Actively Recruiting
6
USA Health Strada Patient Care Center
Mobile, Alabama, United States, 36604
Actively Recruiting
7
Ronald Reagan UCLA Medical Center
Los Angeles, California, United States, 90024
Actively Recruiting
8
Ronald Reagan UCLA Medical Center (inpatient hospital)
Los Angeles, California, United States, 90095
Actively Recruiting
9
Ronald Reagan UCLA Medical Center
Los Angeles, California, United States, 90095
Actively Recruiting
10
UCLA (outpatient clinic)
Los Angeles, California, United States, 90095
Actively Recruiting
11
UCLA Clinical and Translational Research Center (research clinic)
Los Angeles, California, United States, 90095
Actively Recruiting
12
UCLA
Los Angeles, California, United States, 90095
Actively Recruiting
13
Lucile Packard Children's Hospital-Labor and Delivery Unit
Palo Alto, California, United States, 94304
Actively Recruiting
14
Stanford Obstetrics Clinic
Palo Alto, California, United States, 94304
Actively Recruiting
15
Stanford University Medical Center
Palo Alto, California, United States, 94304
Actively Recruiting
16
Stanford University
Palo Alto, California, United States, 94304
Actively Recruiting
17
Anschutz Health Sciences Building (AHSB)
Aurora, Colorado, United States, 80045
Actively Recruiting
18
Children's Hospital Colorado
Aurora, Colorado, United States, 80045
Actively Recruiting
19
CU Research Pharmacy
Aurora, Colorado, United States, 80045
Actively Recruiting
20
University of Colorado AO1 UCH
Aurora, Colorado, United States, 80045
Actively Recruiting
21
University of Colorado Hospital Inpatient Pavilion
Aurora, Colorado, United States, 80045
Actively Recruiting
22
University of Colorado Hospital Outpatient Pavilion
Aurora, Colorado, United States, 80045
Actively Recruiting
23
University of Colorado Research II Building
Aurora, Colorado, United States, 80045
Actively Recruiting
24
Citadelle Clinical Research
North Miami Beach, Florida, United States, 33162
Actively Recruiting
25
Emerald Coast OBGYN Clinical Research
Panama City, Florida, United States, 32405
Actively Recruiting
26
Emerald Coast Pediatrics
Panama City, Florida, United States, 32405
Actively Recruiting
27
HCA Florida Gulf Coast Hospital
Panama City, Florida, United States, 32405
Actively Recruiting
28
Emerald Coast Pediatrics
Panama City Beach, Florida, United States, 32407
Actively Recruiting
29
Advanced Specialty Research
Boise, Idaho, United States, 83702
Actively Recruiting
30
Saint Alphonsus Regional Medical Center
Boise, Idaho, United States, 83706
Actively Recruiting
31
St. Luke's Boise Medical Center
Boise, Idaho, United States, 83712
Actively Recruiting
32
Clinical Research Prime
Idaho Falls, Idaho, United States, 83404
Actively Recruiting
33
Saint Alphonsus Medical Center
Nampa, Idaho, United States, 83687
Actively Recruiting
34
St. Luke's Nampa Medical Center
Nampa, Idaho, United States, 83687
Actively Recruiting
35
Accellacare - McFarland
Ames, Iowa, United States, 50010
Actively Recruiting
36
Mary Greeley Medical Center
Ames, Iowa, United States, 50010
Actively Recruiting
37
McFarland Clinic, PC
Ames, Iowa, United States, 50010
Actively Recruiting
38
University of Kansas Medical Center
Kansas City, Kansas, United States, 66160
Actively Recruiting
39
Velocity Clinical Research, Lafayette
Lafayette, Louisiana, United States, 70508
Actively Recruiting
40
Velocity Clinical Research - New Orleans
New Orleans, Louisiana, United States, 70119
Actively Recruiting
41
Boston Medical Center
Boston, Massachusetts, United States, 02118
Actively Recruiting
42
Velocity Clinical Research, Gulfport
Gulfport, Mississippi, United States, 39503
Actively Recruiting
43
Boeson Research GTF
Great Falls, Montana, United States, 59405
Actively Recruiting
44
OBGYN Associates
Great Falls, Montana, United States, 59405
Actively Recruiting
45
Boeson Research KAL
Kalispell, Montana, United States, 59901
Actively Recruiting
46
Heart & Hands Midwifery
Kalispell, Montana, United States, 59901
Actively Recruiting
47
Boeson Research MSO
Missoula, Montana, United States, 59804
Actively Recruiting
48
Origin Health
Missoula, Montana, United States, 59804
Actively Recruiting
49
Velocity Clinical Research, Grand Island
Grand Island, Nebraska, United States, 68803
Actively Recruiting
50
Velocity Clinical Research, Norfolk
Norfolk, Nebraska, United States, 68701
Actively Recruiting
51
Presbyterian Hospital
Albuquerque, New Mexico, United States, 87107
Actively Recruiting
52
UNM Hospital
Albuquerque, New Mexico, United States, 87107
Actively Recruiting
53
Velocity Clinical Research, Albuquerque
Albuquerque, New Mexico, United States, 87107
Actively Recruiting
54
Lovelace Women's Hospital
Albuquerque, New Mexico, United States, 87109
Actively Recruiting
55
Duke University - Main Hospital and Clinics
Durham, North Carolina, United States, 27705
Actively Recruiting
56
Duke University - Main Hospital and Clinics
Durham, North Carolina, United States, 27710
Actively Recruiting
57
Cincinnati Children's Hospital Medical Center
Cincinnati, Ohio, United States, 45229
Actively Recruiting
58
Prisma Health-Upstate
Greenville, South Carolina, United States, 29605
Actively Recruiting
59
Prisma Health
Greenville, South Carolina, United States, 29605
Actively Recruiting
60
Memorial Hermann Memorial City Hospital
Houston, Texas, United States, 77024
Actively Recruiting
61
The University of Texas Health Science Center at Houston
Houston, Texas, United States, 77204
Actively Recruiting
62
Helios Clinical Research - WEA
Weatherford, Texas, United States, 76086
Actively Recruiting
63
Medical City Weatherford
Weatherford, Texas, United States, 76086
Actively Recruiting
64
Weatherford OB/GYN Associates
Weatherford, Texas, United States, 76086
Actively Recruiting
65
University of Utah
Salt Lake City, Utah, United States, 84112
Actively Recruiting
66
University of Utah Clinical Neuroscience Center
Salt Lake City, Utah, United States, 84132
Actively Recruiting
67
University of Utah Hospital
Salt Lake City, Utah, United States, 84132
Actively Recruiting
68
University of Utah
Salt Lake City, Utah, United States, 84132
Actively Recruiting
69
Sentara Leigh Hospital
Norfolk, Virginia, United States, 23502
Actively Recruiting
70
The Group For Women - Kempsville Office
Norfolk, Virginia, United States, 23502
Actively Recruiting
71
Tidewater Physicians for Women
Norfolk, Virginia, United States, 23502
Actively Recruiting
72
WomensCare Center
Norfolk, Virginia, United States, 23502
Actively Recruiting
73
Virginia Physicians For Women (VPFW)
North Chesterfield, Virginia, United States, 23235
Actively Recruiting
74
Clinical Research Partners, LLC
Richmond, Virginia, United States, 23226
Actively Recruiting
75
Infusion Solutions, LLC
Richmond, Virginia, United States, 23226
Actively Recruiting
76
Seattle Children's Research Institute
Seattle, Washington, United States, 98101
Actively Recruiting
77
Seattle Children's Hospital
Seattle, Washington, United States, 98105
Actively Recruiting
78
University of Washington - Northwest
Seattle, Washington, United States, 98133
Actively Recruiting
79
University of Washington Medical Center - Montlake
Seattle, Washington, United States, 98195
Actively Recruiting
80
Fundación Respirar
Ciudad Autónoma de Buenos Aires, Buenos Aires, Argentina, C1426ABP
Actively Recruiting
81
Clinica Del Niño Y La Madre
Mar del Plata, Buenos Aires, Argentina, 7600
Actively Recruiting
82
Clínica Mayo de Urgencias Médicas Cruz Blanca S.R.L
San Miguel de Tucumán, Tucumán Province, Argentina, 4000
Actively Recruiting
83
Instituto de Maternidad y Ginecología Nuestra Señora de las Mercedes
San Miguel de Tucumán, Tucumán Province, Argentina, 4000
Actively Recruiting
84
Centro de investigación Clínica OSECAC - Sede Jonas Salk
Buenos Aires, Argentina, 1044
Actively Recruiting
85
Equipo Ciencia
Buenos Aires, Argentina, C1428BNF
Actively Recruiting
86
Hospital Público Materno Infantil
Salta, Argentina, 4400
Actively Recruiting
87
Josha Research
Bloemfontein, Free State, South Africa, 9301
Actively Recruiting
88
University of Witwatersrand (WITS) - Vaccines and Infectious Diseases Analytics (VIDA)
Johannesburg, Gauteng, South Africa, 1864
Actively Recruiting
89
Wits RHI
Johannesburg, Gauteng, South Africa, 2001
Actively Recruiting
90
Into Research
Pretoria, Gauteng, South Africa, 0181
Actively Recruiting
91
Family Clinical Research Unit (Fam-Cru)
Cape Town, Western Cape, South Africa, 7500
Actively Recruiting
92
MRC Unit on Child And Adolescent Health
Cape Town, Western Cape, South Africa, 7700
Actively Recruiting
93
University of Cape Town Lung Institute (Pty) Ltd
Cape Town, Western Cape, South Africa, 7700
Actively Recruiting
94
Medical Research Council Unit
Banjul, The Gambia, POBox 273
Actively Recruiting
Research Team
P
Pfizer CT.gov Call Center
CONTACT
How is the study designed?
Study Type
INTERVENTIONAL
Masking
QUADRUPLE
Allocation
RANDOMIZED
Model
PARALLEL
Primary Purpose
PREVENTION
Number of Arms
2
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