A commercially available nasal antiseptic solution "inactivates" COVID-19 just 15 seconds after the coronavirus is exposed to it, effectively preventing the infection from developing, according to a study published Thursday by JAMA Otolaryngology-Head & Neck Surgery. By inactivating the virus, the antiseptic nasal rinse -- a povidone-iodine solution administered in the nostril -- also would help prevent those infected from spreading it to others, the researchers said. The findings are based on lab experiments designed to assess how the rinse affects new coronavirus cells "in vitro," or in test tubes. Researchers have yet to study the rinse in humans with...