Potential coronavirus drug action. Illustration of a molecule of the protease inhibitor camostat mesilate (inset, right) acting to block the binding of a SARS-CoV-2 coronavirus particle (upper left) to a host cell (bottom). Camostat is being investigated as a treatment for Covid-19, the respiratory infection caused by the Sars-CoV-2 coronavirus. Camostat blocks the virus from entering human cells. As of March 2020, the SARS-CoV-2 virus has spread to many countries worldwide and has been declared a pandemic. Over 200,000 have been infected with several thousand deaths.