NCT07222670

A Study Assessing Safety, Tolerability, and Efficacy of INNA-051 in Preventing Respiratory Illness Due to Viral Infections in Healthy Adults 18 to 45 Years of Age

A Randomized, Double-Blind, Two-Part, Placebo-Controlled, Multicenter, Phase 2a Study to Evaluate Safety, Tolerability, and Efficacy of INNA-051 as Prophylaxis for Respiratory Tract Illness in Healthy Adults 18 to 45 Years of Age Who Are at Risk for Viral Respiratory Infections

• Status: Recruiting
• Phase: Phase 2
• Study type: Interventional
• Enrollment: 1,100 (estimated)
• Sponsor: ENA Respiratory Pty Ltd · Industry
• Sex: All
• Age: 18 Years – 45 Years
• Healthy volunteers: Accepted

Summary

Acute upper and lower respiratory infections are a major public health problem and a leading cause of morbidity and mortality worldwide. The purpose of this trial is to assess the safety of the investigational agent INNA-051, given intranasally, and its potential effectiveness in reducing the occurrence, severity, and/or the duration of illness resulting from respiratory virus infections. The trial will enroll generally healthy adults (age 18 - 45 years) who are at risk for exposure to viral respiratory infection, for example, due to living conditions or occupation. Participants will be treated with INNA-051 or placebo once weekly for 4 weeks (Part A) or 12 weeks (Part B) during the respiratory virus season.

Detailed description

Viral respiratory infections are associated with significant morbidity and mortality. The diversity of viruses, along with their propensity for mutation, ignited an interest in host-directed therapies that are effective across a wide range of viral pathogens. Toll-like receptors (TLRs) are potential targets for the development of such agents given their central role in host immune defenses. INNA-051, a TLR2/6 agonist, is being developed as an intranasal innate immune-boosting prophylactic approach for individuals at risk for symptoms and/or complications resulting from respiratory viral infections due to age, occupation, and/or co-morbidities. This randomized, double-blind, two-part, placebo-controlled, multicenter, Phase 2a trial is designed to evaluate the safety, tolerability, and efficacy of INNA-051 in generally healthy adult participants (age 18 to 45 years, inclusive) who are at increased risk for exposure to viral respiratory infections. The primary purpose of Part A of the trial is to assess the safety and tolerability of INNA-051 (bilateral intranasal dry powder) in an outpatient setting compared with placebo. In part A of the trial, INNA-051 will be self-administered once weekly for 4 weeks in an outpatient setting during the respiratory virus season. The purpose of Part B of the trial is to measure the safety, tolerability, and efficacy of INNA-051 bilateral intranasal dry powder compared with placebo in the prevention of symptomatic clinical illness due to RT-qPCR-confirmed viral respiratory infections. In part B of the trial, INNA-051 will be self-administered once weekly for 12 weeks during the North American respiratory virus season.

Conditions

• Viral Respiratory Infection
• Viral Respiratory Illnesses

Interventions

Type	Name	Description
DRUG	INNA-051	powder nasal spray.
OTHER	Placebo	powder nasal spray.

Timeline

• Start date: 2025-12-04
• Primary completion: 2027-02-09
• Completion: 2027-02-09
• First posted: 2025-10-30
• Last updated: 2026-02-11

Locations

5 sites across 1 country: United States

Regulatory

• FDA-regulated drug study