Want to prevent a respiratory infection? A fingerful of Neosporin antibiotic swabbed inside your nose might help you fight off a range of invading respiratory viruses, a new study claims. Advertisement Lab animals whose noses were treated using neomycin -- the main ingredient in over-the-counter Neosporin ointment -- mounted a robust immune defense against both the COVID-19 virus and a highly virulent strain of influenza, researchers found. The same nasal approach also appeared to work in