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Study to Evaluate the Efficacy, Immunogenicity, and Safety of RSVpreF in Adults.

NCT05035212 · Status: ACTIVE_NOT_RECRUITING · Phase: PHASE3 · Type: INTERVENTIONAL · Enrollment: 38861

Last updated 2026-01-28

No results posted yet for this study

Summary

Efficacy Study: This randomized, double-blinded, placebo-controlled Phase 3 study is designed to assess the safety, immunogenicity, and efficacy of a single dose of RSVpreF in the prevention of LRTI-RSV in adults:

* At a dose of 120µg.
* In adults 60 years of age and older.
* The duration of the study for each participant will be up to approximately 24 months.
* The study will be conducted in the United States, Canada, Netherlands, Finland, Argentina, Japan and South Africa.

Substudy A: This study is an extension of the efficacy study and was designed to evaluate the safety and immunogenicity of a second dose of RSVpreF when administered after a dosing interval of approximately 2 years:

* At a dose of 120µg (as studied in the Phase 3 Efficacy Study)
* Blood samples will be collected for antibody testing.
* The duration of the study for each participant will be up to approximately 18 months.
* The study will be conducted in the United States and Argentina.

Substudy B: This study was designed to evaluate the safety and immunogenicity of a second dose of RSVpreF when administered after a dosing interval of approximately 1 year:

* At a dose of 120µg (as studied in the Phase 3 Efficacy Study)
* Blood samples will be collected for antibody testing.
* The duration of the study for each participant will be up to approximately 18 months.
* The study will be conducted in Argentina.

Substudy C: This study was designed to evaluate the safety and immunogenicity of a second dose of RSVpreF when administered after a dosing interval of either 3 or 4 years:

* At a dose of 120µg (as studied in the Phase 3 Efficacy Study)
* Participants will receive either placebo or a second dose of RSVpreF approximately 3 or 4 years after receiving the initial dose of RSVpreF in the main efficacy study.
* Blood samples will be collected for antibody testing.
* The duration of the study for each participant will be up to approximately 24 months.
* The study will be conducted in the United States and Canada.

Conditions

  • Lower Respiratory Tract Illness

Interventions

BIOLOGICAL

Placebo

Placebo

BIOLOGICAL

RSVpreF

RSV vaccine (RSVpreF)

Sponsors & Collaborators

Principal Investigators

  • Pfizer CT.gov Call Center · Pfizer

Study Design

Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
TRIPLE
Model
PARALLEL

Eligibility

Min Age
60 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2021-08-31
Primary Completion
2027-01-18
Completion
2027-01-18
FDA Drug
Yes

Countries

  • United States
  • Argentina
  • Canada
  • Finland
  • Japan
  • Netherlands
  • South Africa

Study Locations

More Related Trials

Entities

Drugs
Companies

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT05035212 on ClinicalTrials.gov