A Study on the Immune Response and Safety of Vaccine Against Respiratory Syncytial Virus Given to Chinese Adults 18 to 59 Years of Age at Increased Risk of Respiratory Syncytial Virus Disease

May 25, 2026 updated by: GlaxoSmithKline

A Phase 3, Randomized, Controlled, Observer Blind, Immuno-bridging Study to Evaluate Immunogenicity, Reactogenicity, Safety of a Single Dose of GSK's RSVPreF3 OA Investigational Vaccine in Chinese Adults 18-59 Years of Age at Increased Risk of Respiratory Syncytial Virus Disease

The study will evaluate the immune response of the RSVPreF3 OA investigational vaccine in Chinese adults 18 to 59 years of age (YOA) who are at increased risk of respiratory syncytial virus (RSV) disease, in comparison with the immune response generated in older adults 60 YOA and above from the 219815 (RSV OA=ADJ-021; NCT06551181) study following a single dose of the RSVPreF3 OA vaccine. In addition, the safety and reactogenicity of the vaccine will also be assessed.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
750

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 3

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Contact Backup

Study Locations

  • China
      • Chengdu, China, 610072
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Xiaobo Huang
      • Chongqing, China, 400030
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Yuming Wang
      • Chongqing, China, 401336
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Peng Hu
      • Guangzhou, China, 510220
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Zhong Haibo
      • Guangzhou, China, 510180
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Zhuxiang Zhao
      • Jiujiang, China
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Xiaoming Xiong
      • Kunming, China, 650032
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Jianqing Zhang
      • Nanning, China, 530000
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Huijuan Li
      • Shanghai, China, 200040
        • Recruiting
        • GSK Investigational Site
        • Principal Investigator:
          • Wenhong Zhang
        • Contact:
        • Contact:
      • Shanghai, China, 200000
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Qin Zhang
      • Zhuhai, China, 519099
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Xi Liu
    • Beijing Municipality
      • Beijing, Beijing Municipality, China, 100049
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Jichao Chen
    • Hunan
      • Xiangtan, Hunan, China, 411228
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Suwen Liu
    • Jiangsu
      • Nanjing, Jiangsu, China, 211112
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Yuwen Su
    • Sichuan
      • Chengdu, Sichuan, China, 611130
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Hongyi Cao

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Participants who, in the opinion of the investigator, can and will comply with the requirements of the protocol.
  • Written or witnessed informed consent obtained from the participant (participant must be able to understand the informed consent) prior to performance of any study-specific procedure.
  • A male or female participant 18-59 YOA at the time of the study intervention administration.

  • Participants should be diagnosed with at least 1 of the following medical conditions if considered medically stable* by the investigator:

    • A stable condition is defined as a disease not requiring significant change (based on the investigator's opinion) in therapy or worsening during the 3 months before enrollment.

      -Chronic cardiopulmonary disease resulting in activity restricting symptoms or use of long-term medication: oChronic obstructive pulmonary disease (COPD)

  • Global Initiative for Chronic Obstructive Lung Disease (GOLD) Grade 2-4 oAsthma
  • Patient on Maintenance and Reliever Therapy (MART) OR with at least one rescue treatment per week (excluding exercise asthma) oCystic fibrosis oOther chronic respiratory diseases: lung fibrosis, restrictive lung disease, interstitial lung disease, emphysema or bronchiectasis oChronic heart failure:
  • A minimum of class II symptoms according to New York Heart Association classification of heart failure oPre-existing CAD (CAD not otherwise specified)
  • Physician diagnosis of CAD based on electrocardiogram, exercise stress test, nuclear stress test, cardiac computed tomography scan or cardiac angiogram (more than the presence of hypercholesterolemia) oCardiac arrhythmia

  • Patient diagnosed with a cardiac arrythmia that require medical support either pharmacologically or with a medical device -Diabetes mellitus: types 1 or 2 with active treatment for the past 6 months

    -Other diseases at increased risk for RSV disease oChronic kidney disease

  • G2-G3 disease (Glomerular Filtration Rate between 30 and 90 mL/min/1.73 m2) oChronic moderate to severe liver disease
  • Female participants of non-childbearing potential may be enrolled in the study. Non childbearing potential is defined as premenarche, hysterectomy, bilateral oophorectomy, bilateral salpingectomy or post-menopause.

  • Female participants of childbearing potential may be enrolled in the study, if the participant:

    • has practiced adequate contraception from 1 month prior to study intervention administration, and
    • has a negative pregnancy test on the day of study prior to intervention administration, and
    • has agreed to continue adequate contraception for at least 1 month after completion of the study intervention administration.

Exclusion Criteria:

Medical conditions

  • Any confirmed or suspected immunosuppressive or immunodeficient condition resulting from disease or immunosuppressive/cytotoxic therapy, based on medical history and physical examination.
  • History of any reaction or hypersensitivity likely to be exacerbated by any component of the study intervention
  • Unstable chronic illness.
  • Any history of dementia or any medical condition that moderately or severely impairs cognition.
  • Recurrent or uncontrolled neurological disorders or seizures. Participants with medically controlled active or chronic neurological diseases can be enrolled in the study as per investigator assessment, provided that their condition will allow them to comply with the requirements of the protocol. Study participants may decide to assign a caregiver to help them complete the study procedures.
  • Significant underlying illness that in the opinion of the investigator would be expected to prevent completion of the study.
  • Any medical condition that in the judgment of the investigator would make intramuscular injection unsafe.
  • Any other clinical condition that, in the opinion of the investigator, might pose additional risk to the participant due to participation in the study.

Prior/Concomitant therapy

•Use of any investigational or non-registered product (drug, vaccine, or medical device) other than the study intervention during the period beginning 30 days before the dose of study intervention (Day -29 to Day 1), or planned use during the study period (up to Contact, Month 6).

  • Planned or actual administration of a vaccine not foreseen by the study protocol in the period starting 30 days before and ending 30 days after the dose of study intervention administration, with the exception of inactivated, subunit and split influenza vaccines or COVID-19 vaccines which can be administered up to 14 days before or from 14 days after the study intervention administration.
  • Previous vaccination with any RSV vaccine, including investigational RSV vaccines.

  • Chronic administration of immune-modifying drugs (defined as more than 14 consecutive days in total) and/or administration of long-acting immune-modifying treatments or planned administration at any time up to the EOS.

    • Up to 3 months prior to the study intervention administration:

oFor corticosteroids, this will mean prednisone >=20 mg/day, or equivalent. Inhaled, topical and intra-articular steroids are allowed oAdministration of immunoglobulins and/or any blood products or plasma derivatives -Up to 6 months prior to study intervention administration: long-acting immune-modifying drugs including among others immunotherapy, monoclonal antibodies, antitumoral medication.

Prior/Concurrent clinical study experience

•Concurrently participating in another clinical study, at any time during the study period, in which the participant has been or will be exposed to an investigational or a non-investigational vaccine/product (drug or invasive medical device).

Other exclusion criteria

  • History of chronic alcohol consumption and/or drug abuse as deemed by the investigator to render the potential participant unable/unlikely to provide accurate safety reports or comply with study procedures.
  • Bedridden participants.
  • Planned move during the study conduct that prohibits participation until study end.
  • Participation of any study personnel or their immediate dependents, family, or household members.
  • Pregnant or lactating female participant.
  • Female planning to become pregnant or planning to discontinue contraceptive precautions within 1 month after study intervention administration.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: RSV AIR group
Participants at increased risk (AIR) of RSV disease will receive a single dose of investigational RSVPreF3 OA investigational vaccine on Visit 1 (Day 1).
Biological: RSVPreF3 OA vaccine
1 dose of RSVPreF3 OA investigational vaccine administered intramuscularly in the deltoid region of the non-dominant arm.
Placebo Comparator: Placebo AIR group
Participants AIR of RSV disease will receive a single dose of Placebo on Visit 1 (Day 1).
Biological: Placebo
1 dose of saline solution administered intramuscularly in the deltoid region of the non-dominant arm.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
RSV-A neutralizing titers expressed as group Geometric Mean Titers (GMTs)
Time Frame: At Day 31 (i.e., 1 month after RSVPreF3 OA investigational vaccine administration)
The serum neutralizing titers are expressed in Estimated Dilution (ED60). The group GMT ratio will be evaluated for RSV-OA overseas group (from RSV OA-ADJ-021 study) over RSV AIR (from the current study).
At Day 31 (i.e., 1 month after RSVPreF3 OA investigational vaccine administration)
RSV-A neutralizing titers expressed as group Seroresponse rate (SRR)
Time Frame: At Day 31 (i.e., 1 month after RSVPreF3 OA investigational vaccine administration)
The SRR is defined as the proportion of participants having a 4-fold increase in neutralizing titers. The group SRR difference will be evaluated for RSV-OA overseas group (from RSV OA-ADJ-021 study) minus RSV AIR (from the current study).
At Day 31 (i.e., 1 month after RSVPreF3 OA investigational vaccine administration)
RSV-B neutralizing titers expressed as group GMTs
Time Frame: At Day 31 (i.e., 1 month after RSVPreF3 OA investigational vaccine administration)
The serum neutralizing titers are expressed in ED60. The group GMT ratio will be evaluated for RSV-OA overseas group (from RSV OA-ADJ-021 study) over RSV AIR (from the current study).
At Day 31 (i.e., 1 month after RSVPreF3 OA investigational vaccine administration)
RSV-B neutralizing titers expressed as group SRR
Time Frame: At Day 31 (i.e., 1 month after RSVPreF3 OA investigational vaccine administration)
The group SRR difference will be evaluated for RSV-OA overseas group (from RSV OA-ADJ-021 study) minus RSV AIR (from the current study).
At Day 31 (i.e., 1 month after RSVPreF3 OA investigational vaccine administration)

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
RSV-A and RSV-B neutralizing titers expressed as group GMTs
Time Frame: At Day 31 and at Month 6 (i.e., 1 month and 6 months after RSVPreF3 OA investigational vaccine administration)
The serum neutralizing titers are expressed in ED60. The group GMT ratio will be evaluated for RSV-OA Chinese group (from RSV OA-ADJ-021 study) over RSV AIR (from the current study).
At Day 31 and at Month 6 (i.e., 1 month and 6 months after RSVPreF3 OA investigational vaccine administration)
RSV-A and RSV-B neutralizing titers expressed as group SRR
Time Frame: At Day 31 and at Month 6 (i.e., 1 month and 6 months after RSVPreF3 OA investigational vaccine administration)
The group SRR difference will be evaluated for RSV-OA Chinese group (from RSV OA-ADJ-021 study) minus RSV AIR (from the current study).
At Day 31 and at Month 6 (i.e., 1 month and 6 months after RSVPreF3 OA investigational vaccine administration)
Number of participants with RT-PCR-confirmed RSV A and/or B-associated acute respiratory illness (ARI) and lower respiratory tract disease (LRTD), assessed for all groups of the current study
Time Frame: Day 1 to Month 6 of the current study
An ARI is defined as the presence of at least 2 respiratory symptoms/signs for at least 24 hours; or at least 1 respiratory symptom/sign and 1 systemic symptom/sign for at least 24 hours. An RT-PCR-confirmed RSV-ARI is an event meeting the case definition of ARI with at least one RSV-positive swab detected by RT-PCR. A LRTD is defined as the presence of at least 2 lower respiratory symptoms/signs for at least 24 hours including at least 1 lower respiratory sign; or at least 3 lower respiratory symptoms for at least 24 hours. An RT-PCR-confirmed RSV-LRTD is an event meeting the case definition of LRTD with at least one RSV-positive swab detected by RT-PCR.
Day 1 to Month 6 of the current study
Duration of RT-PCR-confirmed RSV A and/or B-associated ARI and LRTD episodes, assessed for all the groups of the current study
Time Frame: Day 1 to Month 6 of the current study
Day 1 to Month 6 of the current study
Number of participants reporting symptoms/signs of RT-PCR-confirmed RSV A and/or B-associated ARI and LRTD, assessed for all the groups of the current study
Time Frame: Day 1 to Month 6 of the current study
Day 1 to Month 6 of the current study
Number of participants with RT-PCR-confirmed RSV A and/or B-associated ARI and LRTD by severity, assessed for all the groups of the current study
Time Frame: Day 1 to Month 6 of the current study
Day 1 to Month 6 of the current study
Number of participants with RT-PCR-confirmed RSV A and/or B-associated ARI and LRTD by frailty status, assessed for all the groups of the current study
Time Frame: Day 1 to Month 6 of the current study
Day 1 to Month 6 of the current study
Number of participants with each solicited administration site event assessed for all the groups of the current study
Time Frame: Day 1 to Day 7 of the current study
Solicited administration site event are pain, erythema and swelling.
Day 1 to Day 7 of the current study
Number of participants with each solicited systemic event assessed for all the groups of the current study
Time Frame: Day 1 to Day 7 of the current study
Solicited systemic events are fever, myalgia (muscle pain), arthralgia (joint pain), headache and fatigue (tiredness). Fever is defined as a temperature of more than or equal to (>=) 38.0 degrees Celsius (°C).
Day 1 to Day 7 of the current study
Number of participants with unsolicited adverse events (AEs) assessed for all the groups of the current study
Time Frame: Day 1 to Day 30 of the current study
An unsolicited AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of a study intervention, whether or not considered related to the study intervention that was either not included in the list of solicited events or could be included in the list of solicited events but with an onset outside the specified period of follow-up for solicited events.
Day 1 to Day 30 of the current study
Number of participants with serious adverse events (SAEs) assessed for all the groups of the current study
Time Frame: Day 1 up to study end (Month 6) of the current study
An SAE is defined as any untoward medical occurrence that, at any dose, results in death, is life-threatening, requires inpatient hospitalization or prolongation of existing hospitalization, results in persistent or significant disability/incapacity, is a congenital anomaly/birth defect in the offspring of a study participant, abnormal pregnancy outcomes, is a suspected transmission of any infectious agent via an authorized medicinal product. or any other situation considered as such by the investigator.
Day 1 up to study end (Month 6) of the current study
Number of participants with potential immune-mediated disease (pIMDs) assessed for all the groups of the current study
Time Frame: Day 1 up to study end (Month 6) of the current study
PIMDs are a subset of adverse events of special interest that include autoimmune diseases and other inflammatory and/or neurologic disorders of interest which may or may not have an autoimmune etiology.
Day 1 up to study end (Month 6) of the current study

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
GlaxoSmithKline

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
October 29, 2025

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
September 25, 2026

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
March 12, 2027

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
October 21, 2025

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
October 21, 2025

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
October 23, 2025

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
May 27, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 25, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
May 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 223372

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

GSK will assess requests from qualified researchers for anonymized individual patient-level data and related study documents. Data sharing is subject to certain criteria, conditions, and exceptions. For further information, refer to https://www.gsk-studyregister.com/About_GSK_Patient_Level_Data_Sharing_Final_13July2023.pdf.

IPD Sharing Time Frame

Anonymized IPD will be made available within 6 months of publication of primary, key secondary and safety results for studies in product with approved indication(s) or terminated asset(s) across all indications.

IPD Sharing Access Criteria

Anonymized IPD is shared with researchers whose proposals are approved by an Independent Review Panel and after a Data Sharing Agreement is in place. Access is provided for an initial period of 12 months but an extension may be granted, when justified, for up to 6 months.

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • SAP
  • ICF
  • CSR

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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