Regeneron starts late-stage trials of antiviral antibody cocktail in Covid-19 July 6, 2020 Auto Bot BioPharma, biopharma nl, National Institute of Allergy and Infectious Diseases, New York, Regeneron Pharmaceuticals, REGN-COV2, SARS-CoV-2, Tarrytown 0 The company also said that the Phase III study of the autoimmune disease drug Kevzara that it was running with Sanofi failed to meet either its primary or key secondary endpoints among critically ill Covid-19 patients.