A nasal spray that can prevent COVID-19 for up to two days has been developed by researchers in the UK – and it may be available over the counter by the summer, according to a report. The spray — developed by scientists at the University of Birmingham — prevents infection by capturing the bug in the nose and covering it in a coating from which it cannot escape, The Telegraph reported. As a result, it would be safe for someone to exhale near another person because the virus would be inactive and harmless, the outlet said.