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ClinicalTrials.gov 4 recruiting now official registry

Respiratory Syncytial Virus Infections clinical trials

Every US clinical trial registered for Respiratory Syncytial Virus Infections — phase mix, recruiting status, and the sponsors running them, straight from the NIH ClinicalTrials.gov registry.

22 US clinical trials · 4 currently recruiting

The research picture

Respiratory Syncytial Virus Infections has 22 registered US clinical trials, 4 of them open to new participants right now — about 18% of the total.

4
recruiting participants now
18%
of trials open to enrollment
9
in Phase 3–4 (later-stage)
11
top sponsor: GlaxoSmithKline

Counts reflect the public ClinicalTrials.gov registry as last mirrored by PlainTrial. Status and phase are reported by each study's sponsor. This is reference information, not medical advice.

Active & Recent Trials

RECRUITING Phase 3 370 participants

Azithromycin Treatment for Respiratory Syncytial Virus-induced Respiratory Failure in Children

University of Alabama at Birmingham

NCT05026749

RECRUITING Phase 2 192 participants

A Study of S-337395 in Symptomatic Nonhospitalized Adults With Respiratory Syncytial Virus (RSV) Who Are at High Risk of Progression to Severe Disease

Shionogi

NCT07214571

RECRUITING Phase 2 184 participants

A Study Evaluating Persistence of the Immune Response of the Adjuvanted Respiratory Syncytial Virus (RSV) Vaccine and the Safety and Immune Response Following Revaccination in Adults 18 Years of Age and Above Who Received Lung or Kidney Transplant

GlaxoSmithKline

NCT07092865

RECRUITING Phase 1 137 participants

A Study of BLB-201 RSV Vaccine in Infants and Children

Blue Lake Biotechnology

NCT05655182

ACTIVE NOT RECRUITING Phase 3 10,212 participants

An Extension and Crossover Vaccination Study on the Immune Response and Safety of a Vaccine Against Respiratory Syncytial Virus Given to Adults 60 Years of Age and Above Who Participated in RSV OA=ADJ-006 Study

GlaxoSmithKline

NCT06534892

ACTIVE NOT RECRUITING Phase 3 1,720 participants

Immunogenicity, Safety, Reactogenicity and Persistence of an Investigational Respiratory Syncytial Virus (RSV) Vaccine in Adults Aged 60 Years and Above

GlaxoSmithKline

NCT04732871

ACTIVE NOT RECRUITING Phase 1 213 participants

A Study on the Safety and Immune Response to an mRNA-based RSV Investigational Vaccine in Healthy Adults Aged 18-45 Years

GlaxoSmithKline

NCT06573281

ACTIVE NOT RECRUITING Phase 1 51 participants

Safety and Immunogenicity of CodaVax-RSV in Seropositive and Seronegative Children

Codagenix

NCT04919109

COMPLETED Phase 3 3,855 participants

A Follow-up Study to Describe the Safety of Study Participants Who Received RSVPreF3 Maternal Vaccination (Any Dose) or Controls From Previous RSV MAT Studies During Any Pregnancy Conceived Post Vaccination/Control

GlaxoSmithKline

NCT05705440

COMPLETED Phase 3 1,586 participants

A Phase III Study to Assess the Lot-to-lot Consistency of GSK's Investigational RSV Maternal Vaccine and the Immune Response and Safety of RSV Maternal Vaccine When Given Alone or Co-administered With GSK's Influenza D-QIV Vaccine in Healthy Non-pregnant Women.

GlaxoSmithKline

NCT05045144

COMPLETED Phase 3 1,177 participants

Study to Evaluate the Efficacy and Safety of Suptavumab (REGN2222) for the Prevention of Medically Attended RSV (Respiratory Syncytial Virus) Infection in Preterm Infants

Regeneron Pharmaceuticals

NCT02325791

COMPLETED Phase 3 841 participants

A Study on the Immune Response and Safety of a Vaccine Against Respiratory Syncytial Virus (RSV) When Given Alone and Together With a COVID-19 mRNA Vaccine in Adults Aged 50 Years and Above

GlaxoSmithKline

NCT06374394

COMPLETED Phase 3 770 participants

A Study of 3 Lots of an Investigational Vaccine Against Respiratory Syncytial Virus (RSV) in Adults Aged 60 Years and Above

GlaxoSmithKline

NCT05059301

COMPLETED Phase 3 530 participants

A Study on Safety and Immune Response of Investigational RSV OA Vaccine in Combination With Herpes Zoster Vaccine in Healthy Adults

GlaxoSmithKline

NCT05966090

COMPLETED Phase 2 386 participants

A Study on the Immune Response and Safety of an RSV Vaccine When Given to Adults 18 Years of Age and Above Who Received Lung or Kidney Transplant and Are at an Increased Risk of Respiratory Syncytial Virus Lower Respiratory Tract Disease and Compared to Healthy Adults 50 Years of Age and Above

GlaxoSmithKline

NCT05921903

COMPLETED 300 participants

Association Between Cytokines and Severity of Respiratory Syncytial Virus (RSV)-Induced Illness in the Elderly

West Penn Allegheny Health System

NCT00609635

COMPLETED Phase 1 150 participants

Safety Study of Respiratory Syncytial Virus (RSV)-Fusion (F) Protein Particle Vaccine

Novavax

NCT01290419

COMPLETED Phase 1 107 participants

A Study to Evaluate Safety, Reactogenicity and Immunogenicity of GSK Biologicals' RSV Investigational Vaccine Based on Viral Proteins Encoded by Chimpanzee-derived Adenovector (ChAd155-RSV) (GSK3389245A) in RSV-seropositive Infants

GlaxoSmithKline

NCT02927873

COMPLETED Phase 2 50 participants

RSV F Vaccine Maternal Immunization Study in Healthy Third-trimester Pregnant Women.

Novavax

NCT02247726

COMPLETED Phase 1 50 participants

Evaluating the Safety and Immune Response to a Single Dose of a Respiratory Syncytial Virus (RSV) Vaccine in RSV-Seronegative Infants and Children

National Institute of Allergy and Infectious Diseases (NIAID)

NCT01852266

COMPLETED Phase 1 33 participants

Evaluating the Infectivity, Safety and Immunogenicity of a Recombinant Live-Attenuated Respiratory Syncytial Virus Vaccine in RSV-Seronegative Infants 6 to 24 Months of Age

National Institute of Allergy and Infectious Diseases (NIAID)

NCT02794870

COMPLETED Phase 1 3 participants

Safety and Immune Response to a Live-Attenuated Respiratory Syncytial Virus (RSV) Vaccine in RSV-Seronegative Infants and Children

National Institute of Allergy and Infectious Diseases (NIAID)

NCT02040831

Phase Distribution

PhaseTrial count
Phase 1 8
Phase 2 4
Phase 3 9

Source: ClinicalTrials.gov, National Library of Medicine. Data is informational only.

Reading the Respiratory Syncytial Virus Infections Trial Landscape

ClinicalTrials.gov lists 22 US studies indexed under Respiratory Syncytial Virus Infections, and 4 of those are currently open to recruitment — roughly 18% of the total volume on the registry. That ratio is a useful proxy for activity level: a high share of recruiting studies often signals that research interest is current and that new enrollment opportunities are appearing, while a low share typically means the field is dominated by completed or follow-up work where most participant spots have already been filled. These counts reflect the public registry only and include studies at every stage of design, so they should be read as an index of research attention rather than as a measure of treatment availability.

The phase distribution for Respiratory Syncytial Virus Infections shows 9 late-stage studies (Phase 3 and Phase 4 combined) alongside 12 earlier-phase entries (Phase 1 through Phase 2). Phase 1 and Phase 2 studies focus on early safety signals, dosing, and preliminary effect, while Phase 3 studies are typically the larger efficacy and safety trials submitted toward regulatory review, and Phase 4 studies follow approved interventions in real-world use. A condition weighted toward later phases often reflects a mature research pipeline with several interventions already close to or past approval, whereas a heavier early-phase tilt suggests the field is still exploring new mechanisms and candidate approaches.

Top sponsor activity for Respiratory Syncytial Virus Infections is led by GlaxoSmithKline with 11 indexed trials, alongside 8 other organizations in the top contributor list. The list on this page surfaces up to 22 of the most relevant recent and active entries, ordered with recruiting studies first so practical options are visible. All figures are derived from the public ClinicalTrials.gov dataset maintained by the National Library of Medicine and are reproduced here for reference. Inclusion of a trial, sponsor, or intervention on this page is neither an endorsement nor a recommendation — eligibility, protocol changes, and site-level status can shift frequently, so always verify current details on ClinicalTrials.gov and consult a qualified healthcare provider before acting on anything you see here.

Frequently Asked Questions

How many clinical trials are there for Respiratory Syncytial Virus Infections?

PlainTrial tracks 22 US clinical trials for Respiratory Syncytial Virus Infections, of which 4 are currently recruiting participants. Data sourced from ClinicalTrials.gov.

How do I find a recruiting trial for Respiratory Syncytial Virus Infections?

Use the trial list above filtered by "Recruiting" status, or visit our trial finder at /recruiting to search by condition and state. Always discuss trial participation with your healthcare provider before enrolling.

Is this data current?

Data is sourced from ClinicalTrials.gov and reflects our most recent data pull. Trial status may have changed since then. Always verify current information at ClinicalTrials.gov before making decisions about participation.

Related

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from ClinicalTrials.gov (National Library of Medicine). Consult a qualified professional before making decisions based on this data.

Source: ClinicalTrials.gov (NIH/NLM) ClinicalTrials.gov AACT registry · 2026 Trial counts and statuses sourced from ClinicalTrials.gov. Sponsor counts include both industry and federal/academic sponsors.

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