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Phase 2b study of S-337395 in symptomatic nonhospitalized adults with respiratory syncytial virus who are at high risk of progression to severe disease

A phase 2b, multicenter, randomized, double-blind, placebo-controlled, parallel-group study to evaluate the safety, tolerability, and efficacy of S-337395 in symptomatic nonhospitalized adults with respiratory syncytial virus who are at high risk of progression to severe disease

Status
Recruiting
Phases
Phase 2
Study type
Interventional
Source
JPRN
Registry ID
JPRN-jRCT2031250549
Enrollment
192
Registered
2025-12-05
Start date
2026-01-30
Completion date
Unknown
Last updated
2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

RS virus infection

Interventions

Sponsors

Gomez Juan Carlos
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: - Participant must be 18 years of age or older at the time of screening - Participants who have new onset or worsening (if present chronically) of at least 1 of the following signs and/or symptoms consistent with a viral acute respiratory infection within 72 hours prior to randomization: fever, nasal congestion, nasal discharge, sore throat, cough, sputum production, shortness of breath, or wheezing - Participants diagnosed with RSV infection - Has at least 1 of the following risk factors for severe RSV disease

Exclusion criteria

Exclusion criteria: - Hospitalized or expected to be hospitalized within 24 hours of screening - Is considered by the investigator to be immunocompromised, due to an underlying medical condition or medical therapy, chemotherapy, radiation, stem cell or solid organ transplant - Suspicion or known severe renal impairment or ongoing dialysis - Has received a therapy intended to treat RSV infection within 14 days prior to screening - Is receiving chemotherapy or immunotherapy for malignancy - Has received RSV vaccination within 7 days prior to screening - Has had either confirmed severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) or influenza infection (test was positive) during the 28 days prior to screening - Has any other confirmed clinically relevant respiratory infection by any pathogen at, or within 28 days of screening

Design outcomes

Primary

MeasureTime frame
Change from baseline in RSV RNA load by qRT-PCR (nasopharyngeal swab)

Countries

Argentina, Bulgaria, Japan, Poland, South Africa, Taiwan, United States, Vietnam

Contacts

Public ContactCorporate Communications Department

Shionogi & Co., Ltd.

shionogiclintrials-admin@shionogi.co.jp+81-6-6209-7885

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026