Nitric Oxide (NO) has been shown to be important in COVID-19 and SARS-CoV-2 infection. Arginine and citrulline have been considered and are being studied for both prophylaxis and treatment of COVID-19. Can someone who has the data available, do a study of those people who are prophylactically taking NO agonists (ED Meds) to see if these people are getting infected. Secondly, are these people on ED Meds getting milder disease if they do get infected. Thank you. Gary Ordog, MD