Washington, Jan 13 Researchers have created new molecules that can be sprayed into the nose to block the SARS-CoV-2 virus from entering the lungs and causing infection. The COVID-19 virus enters the body through the lungs when people breathe, resulting in illness. Engineers at the Johns Hopkins University in the US have now created thin, thread-like strands of molecules called supramolecular filaments capable of blocking the virus in its tracks.