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

Inclusion Criteria: * In good general health and without clinically significant medical, psychiatric, chronic or intermittent health conditions. * At risk for exposure to viral respiratory infection, for example, living in crowded housing, university housing, or military barracks, working in a childcare center or caring for a child aged 10 or less, healthcare workers, factory workers, taxi and bus drivers, grocery clerks, and educators or counselors who work in crowded environments or with multiple exposures with different people daily. * Agree to use highly effective birth control. Exclusion Criteria: * Presence of Type I or Type II diabetes, asthma or other chronic respiratory condition. * History of Human Immunodeficiency (HIV), any history of replicating Hepatitis B, and any history of untreated, active Hepatitis C. * Receipt of investigational product within 90 days or 5 half-lives of the product, whichever is longer. * Active clinical signs or symptoms of acute respiratory illness (runny nose, sore throat, fever, etc.). * Received a vaccine against Respiratory Syncytial Virus (RSV) within 90 days. * Pregnant or lactating women.