An antibody cocktail developed by Regeneron Pharmaceuticals Inc. has received emergency use authorization (EUA) from the FDA for the treatment of mild to moderate COVID-19. Monoclonal antibodies (Mabs) such as Regeneron's, called casirivimab and imdevimab, "have the greatest benefit when given early after diagnosis and in patients who have not yet mounted their own immune response or who have high viral load," the company said.