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RSV InfectionPhase 2NCT06784973

Study of Obeldesivir to Treat Children With Respiratory Syncytial Virus (RSV) Infection

A Phase 2 study testing Obeldesivir in people with RSV Infection, run by Gilead Sciences at 56 sites in 2 countries.

Terminated

Stopped early. The study ended before it was planned to and will not resume.

Official record
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Trial summary

The goal of this clinical study is to check if obeldesivir (ODV; GS-5245) is safe and well-tolerated by children with respiratory syncytial virus (RSV) infection. It will also look at how well ODV helps reduce the time it takes for children to feel better and for their RSV symptoms to improve. Read more about this study

Who is it for?
Ages Up to 5 years
Conditions the study is for
RSV Infection
What is being tested?
Obeldesivir
Type of treatment
Pill or oral medicine
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
4 participants
Where
56 sitesin 2 countries
Study dates
5 Mar 2025to 16 Apr 2025
Phase
Phase 2
Are there results?
Yes, posted in the registrySummary in the doctors' view

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages Up to 5 years
  • All sexes
  • No healthy volunteers
  • Child

Who may be able to join

  • Participants assigned male or female at birth, from birth to < 5 years of age who meet one of the following criteria, where permitted according to local law and approved nationally and by relevant institutional review board or independent ethics committee:
  • Cohort 1: Infants and children from 4 weeks postnatal age, weighing ≥ 3 kg to < 40 kg (Part A) and ≥ 1.5 kg to < 3 kg (Part B)
  • Cohort 2: Neonates, either born at term or preterm, weighing ≥ 1.5 kg to < 6 kg
  • RSV infection diagnosis ≤ 3 days prior to randomization.
  • Negative test for influenza A/B, and severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2 infection) ≤ 7 days prior to randomization.
  • Onset of RSV signs or symptoms ≤ 3 days prior to randomization.
  • Presence of at least 1 sign or symptom of RSV infection at screening and at randomization.

Who cannot join

  • Currently requiring or expected to require hospitalization for RSV infection within 48 hours after randomization.
  • Not expected to survive the current RSV-related illness.
  • Documented previous infection and/or hospitalization for RSV during the current respiratory virus season.
  • Diagnosed with acute concurrent active systemic infections requiring treatment with systemic antiviral, antibacterial, antifungal, or antimycobacterial therapy, or with any documented respiratory viral infection (other than RSV), ≤ 7 days prior to randomization.
  • History of asthma or recurrent wheezing.
  • Neuromuscular disease that affects swallowing.
Show all 14Show fewer
  • Cystic fibrosis.
  • Participants who are immunocompromised.
  • Alanine aminotransferase ≥ 5 × upper limit of normal (ULN).
  • Abnormal renal function.
  • Concurrent or previous treatment with other agents with actual or possible direct antiviral activity against RSV, received within 28 days or within 5 half-lives, whichever is longer, prior to randomization.
  • Received palivizumab within 100 days, or nirsevimab within 1 year, or other RSV specific monoclonal antibody within 5 half-lives of the antibody, prior to randomization.
  • Participant whose mother received RSV vaccination during pregnancy and who is < 1 year old prior to randomization.
  • Note: Other protocol defined Inclusion/Exclusion criteria may apply.

Trial locations and contacts

56 sites in 2 countries.

56 sites in 2 countries

United States41 sites
  • Children's of Alabama

    Birmingham, Alabama, 35233

  • Helios Clinical Research

    Burleson, Texas, 76028

  • Epic Medical Research -Oklahoma

    Chickasha, Oklahoma, 73018

  • Epic Medical Research - DeSoto

    DeSoto, Texas, 75115

  • Dolphin Medical Research

    Doral, Florida, 33172

  • PAS Research

    Edinburg, Texas, 78539

  • Boeson Research

    Great Falls, Montana, 59405

  • Helios Clinical Research

    Houston, Texas, 77008

  • Biopharma Informatic, LLC

    Houston, Texas, 77043

  • Sunrise Pediatrics

    Houston, Texas, 77077

  • Biopharma Informatic, LLC

    Houston, Texas, 77084

  • Pioneer Research Solutions Inc.

    Houston, Texas, 77099

  • Clinical Research Prime

    Idaho Falls, Idaho, 83404

  • Boeson Research

    Kalispell, Montana, 59901

  • Tanner Clinic

    Kaysville, Utah, 84037

  • Velocity Clinical Research, Lafayette

    Lafayette, Louisiana, 70508

  • Radiance Clinical Research

    Lampasas, Texas, 76550

  • Tanner Clinic

    Layton, Utah, 84041

  • UCLA (Outpatient Clinic)

    Los Angeles, California, 90095

  • Alliance Research Institute

    Lynwood, California, 90262

  • Boeson Research

    Missoula, Montana, 59804

  • Paradigm Clinical Research

    Modesto, California, 95355

  • Velocity Clinical Research - Norfolk

    Norfolk, Nebraska, 68701

  • Velocity Clinical Research, Omaha

    Omaha, Nebraska, 68134

  • Midway Medical Clinic

    Oneonta, Alabama, 35121

  • Nona Pediatric Center

    Orlando, Florida, 32829

  • Cohen Children's Medical Center Pharmacy New Pavillion

    Phoenix, Arizona, 11040

  • Velocity Clinical Research, Phoenix

    Phoenix, Arizona, 85015

  • PAS Research

    Pittsburgh, Pennsylvania, 15227

  • Boeson Research PVU

    Provo, Utah, 84604

  • Pediatric Center

    Richmond, Texas, 77469

  • Central Texas Medical Research, LLC

    San Antonio, Texas, 78232

  • Paradigm Clinical Research Centers, LLC

    San Diego, California, 92108

  • FOMAT - Jeffrey Kaplan MD Inc Pediatric Medicine

    Santa Maria, California, 93454

  • Velocity Clinical Research, Sioux City

    Sioux City, Iowa, 51106

  • Child Health Care Associates

    Syracuse, New York, 13210

  • PAS Research

    Tampa, Florida, 33613

  • North Houston Internal Medicine and Pediatric Clinic

    Tomball, Texas, 77375

  • Rophe Adult and Pediatric Medicine/SKYCRNG

    Union City, Georgia, 30291

  • Velocity Clinical Research, Washington DC

    Washington D.C., District of Columbia, 20016

  • Tekton Research, LLC

    Yukon, Oklahoma, 73099

Other trials in United States

Japan15 sites
  • Yoshimura Child Clinic

    Akashi, 674-0068

  • Japan Community Healthcare Organization Kyushu Hospital

    Fkitakyushu, 806-0034

  • Uchida child clinic

    Fukuoka, 814-0104

  • Shindo Children's Clinic

    Fukuoka, 814-0121

  • SEKI Children's CLINIC

    Fukuoka, 814-0123

  • Ryuseidai Children's Clinic

    Ibaraki, 305-0008

  • Isesaki Municipal Hospital

    Isesaki, 372-0817

  • Abe Child Clinic

    Kanagawa, 223-0051

  • Okada Kodomonomori Clinic

    Kasukabe, 344-0011

  • Yutaka Children Clinic

    Kobe, 651-2273

  • Kochi Health Sciences Center

    Kochi, 781-8555

  • Japan Community Healthcare Organization Chukyo Hospital

    Nagoya

  • Shimamura Memorial Hospital

    Nerima-ku, 177-0051

  • Shizuoka Welfare Hospital

    Shizuoka, 420-0005

  • Shizuoka City Shimizu Hospital

    Shizuoka, 424-8636

Other trials in Japan

About this study

Official title: A Phase 2, Randomized, Multicenter, Double-blind, Placebo-controlled Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Efficacy of Obeldesivir in Participants From Birth to < 5 Years of Age With Respiratory Syncytial Virus (RSV) Infection

The goal of this clinical study is to check if obeldesivir (ODV; GS-5245) is safe and well-tolerated by children with respiratory syncytial virus (RSV) infection. It will also look at how well ODV helps reduce the time it takes for children to feel better and for their RSV symptoms to improve.

The primary objectives of this study are: a) to evaluate the safety and tolerability of ODV in pediatric participants with RSV infection; b) To evaluate the efficacy of ODV on time to alleviation of targeted RSV symptoms in pediatric participants with RSV infection.

Read the detailed description

Pediatric participants will be enrolled as follows:

  • Cohort 1: Infants and children from 4 weeks postnatal age, weighing ≥ 1.5 kg to < 40 kg
  • Cohort 2: Neonates, either born at term or preterm, weighing ≥ 1.5 kg to < 6 kg
Conditions
RSV Infection
Being tested
Obeldesivir, Obeldesivir Placebo
Medical subject headings
Respiratory Syncytial Virus Infections

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • ObeldesivirDrug

    Also called ODV, GS-5245

    Administered orally

  • Obeldesivir PlaceboDrug

    Administered orally

Study groups in NCT06784973
Study groupRoleWhat they receive
Cohort 1: Part A (Group 2) - Obeldesivir (ODV)ExperimentalParticipants weighing ≥ 12 kg to < 20 kg, will receive ODV 175 mg, orally, twice on Day 1, followed by ODV 116.6 mg, orally, twice daily on Days 2 to 5.
Receives: Drug: Obeldesivir
Cohort 1: Part A (Group 3) - ODVExperimentalParticipants weighing ≥ 6 kg to < 12 kg, will receive ODV 116.6 mg, orally, twice on Day 1, followed by ODV 58.3 mg, orally, twice daily on Days 2 to 5.
Receives: Drug: Obeldesivir
Cohort 1: Part A (Group 3) - PlaceboPlacebo comparatorParticipants weighing ≥ 6 kg to < 12 kg, will receive placebo-to-match ODV, orally, twice daily on Days 1 to 5.
Receives: Drug: Obeldesivir Placebo

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Percentage of Participants Who Experienced Treatment-Emergent Adverse Events (TEAEs) by Day 28

    TEAEs were defined as any adverse events that began on or after the date of first dose of study drug up to the date of last dose of study drug up to Day 28. The percentage of participants who experienced at least one TEAE was assessed from Day 1 through Day 28.

    Measured: Up to Day 28

  2. Percentage of Participants Who Experienced Grade 3 or 4 Treatment-Emergent Laboratory Abnormalities by Day 28

    A treatment-emergent laboratory abnormality was defined as an increase of at least 1 toxicity grade from baseline at any time postbaseline up to and including the date of last study drug dose up to Day 28. A treatment-emergent laboratory abnormality severity was graded according to the Division of AIDS (DAIDS) Version 2.1. Grade 0: Values that do not meet the criteria for an abnormality of at least Grade 1;Grade 1: Mild; Grade 2: Moderate; Grade 3: Severe; Grade 4: Potentially life-threatening. The percentage of participants who experienced Grade 3 or 4 laboratory abnormalities was assessed from Day 1 through Day 28.

    Measured: Up to Day 28

  3. Time to Alleviation of Targeted Respiratory Syncytial Virus (RSV) Symptoms by Day 28

    Alleviation of targeted RSV symptoms was defined as achievement of 2 consecutive daily assessments with improvement in score by at least 1 point for any targeted RSV symptom with baseline score is > 1, or no increase in score for any targeted RSV symptom with baseline score of 1, assessed from Day 1 to Day 28. The time to alleviation of targeted RSV symptoms by Day 28 was calculated as the symptom alleviation date minus the first dose date. Targeted RSV symptoms referred to the RSV symptoms (cough, respiratory signs, RSV signs, behavior impact).

    Measured: Up to Day 28

Secondary outcomes (8)
  1. PK Parameter: AUCtau of GS-441524, Metabolite of Obeldesivir

    AUCtau is defined as area under the plasma concentration-time curve during a dosing interval (AUCtau) of GS-441524, the active metabolite of obeldesivir.

    Measured: Day 5 (predose, 2.5, and 3.5 hours post-dose)

  2. PK Parameter: Cmax of GS-441524, Metabolite of Obeldesivir

    Cmax is defined as maximum plasma concentration of GS-441524, the active metabolite of obeldesivir.

    Measured: Day 1 (0.25, 0.75, and 2 hours post-dose); Day 5 (predose, 2.5, and 3.5 hours post-dose)

  3. PK Parameter: Ctrough of GS-441524, Metabolite of Obeldesivir

    Ctrough is defined as the trough observed drug concentration [measured concentration at predose of Day 5 (taken directly before next administration)].

    Measured: Day 5: Predose

  4. Change From Baseline in RSV Nasal Swab Viral Load at Day 5

    Nasal swab samples was used to assess RSV viral load by reversetranscriptase-quantitative polymerase chain reaction (RT-qPCR), respiratory coinfection by multiplex respiratory pathogen PCR, potential infectious viral titer assessment, and potential resistance testing (by sequencing and/or phenotyping). Baseline was defined as the last available value collected on or prior to first dose of study drug.

    Measured: Baseline, Day 5

  5. Time to Sustained Alleviation of Targeted RSV Symptoms by Day 28

    Sustained alleviation of targeted RSV symptoms was defined as 3 daily consecutive assessments (48-hour period) with improvement in score by at least 1 point for any targeted RSV symptom with baseline score is > 1; or no increase in score for any targeted RSV symptom with baseline score of 1, assessed from Day 1 to Day 28. The time to sustained alleviation of targeted RSV symptoms by Day 28 was calculated as the symptom alleviation date minus the first dose date. Targeted RSV symptoms referred to the RSV symptoms (cough, respiratory signs, RSV signs, behavior impact).

    Measured: Up to Day 28

  6. Time to Resolution of Targeted RSV Symptoms by Day 28

    Resolution of targeted RSV symptoms was defined as: for 2 daily consecutive assessments, improvement in score resulting in score of ≤2 for any targeted RSV symptom with baseline score >2; no increase or an improvement in score resulting in score of ≤2 for any targeted RSV symptom with baseline score of 2; no increase in score for any targeted RSV symptom with baseline score of 1. The time to resolution of targeted RSV symptoms by Day 28 was calculated as the resolution date/time minus the first dose date/time. Targeted RSV symptoms referred to RSV symptoms (cough, respiratory signs, RSV signs, behavior impact).

    Measured: Up to Day 28

  7. Number of Participants With Palatability Questionnaire Response as Assessed by the Caregiver at Days 1 and 5

    Caregivers were asked to rate how the study drug tasted to their child. A questionnaire was administered to caregivers to assess palatability. Palatability was assessed by caregivers using a questionnaire on Day 1 and Day 5 with response options: Super Good, Good, Maybe Good or Maybe Bad, Bad, or Super Bad.

    Measured: Days 1 and 5

  8. Number of Participants With Acceptability Questionnaire Response as Assessed by the Caregiver at Days 1 and 5

    Caregivers were asked to evaluate how easy it was for children to take the study drug. A questionnaire was administered to caregivers to assess acceptability. Acceptability was assessed by caregivers using a questionnaire with response options: Super Easy, Easy, Maybe Easy or Maybe Hard, Hard, or Super Hard. The questionnaire evaluated how easy it was for children to take the study drug.

    Measured: Days 1 and 5

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted20 Jan 2025
  2. Study start5 Mar 2025
  3. Primary completion16 Apr 2025
  4. Study completion16 Apr 2025

Why it stopped: Study was terminated by Sponsor; the decision was not due to any safety findings.

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 2
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
Double blind
Who is masked
Participant, Investigator
Enrolment
4 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT06784973
Sponsor's protocol ID
GS-US-685-6883
Other IDs
jRCT2031240735
Status last verified
May 2026
First submitted
15 Jan 2025
Last updated
8 Jun 2026
Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing Obeldesivir in people with RSV Infection, run by Gilead Sciences at 56 sites in 2 countries.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 7 inclusion and 14 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: stopped early, as of the sponsor's last update on 8 Jun 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 56 sites in United States, Japan. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

Yes. Results are posted in the registry (first posted 8 Jun 2026). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Percentage of Participants Who Experienced Treatment-Emergent Adverse Events (TEAEs) by Day 28 (time frame: Up to Day 28). The study lists 3 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 8 Jun 2026.

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