Gilead ends RSV trials for obeldesivir amid low infection rates

30 June 2025

US biotech major Gilead Sciences (Nasdaq: GILD) has halted two mid-stage studies of its experimental antiviral obeldesivir after low rates of respiratory syncytial virus (RSV) infections undermined the feasibility of measuring symptom relief in patients.

The trials, focused on outpatient adults and children with acute RSV, were called off after what the company described as a challenging season for patient recruitment. Gilead said the studies failed to gather sufficient data to meaningfully assess the primary endpoint, which was the reduction in symptom duration.

The move does not stem from any safety or efficacy issues, according to the company, which plans to share results from the discontinued studies in due course to help evaluate future possibilities for the oral antiviral.

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