On Apr. 12, 2021, Roche confirmed positive results from the phase III REGN-COV 2069 trial assessing the ability of the investigational antibody cocktail casirivimab and imdevimab to reduce the risk and burden of COVID-19 infection among household contacts of SARS-CoV-2 infected individuals.

The trial, which was jointly run with the National Institute of Allergy and Infectious Diseases, met its primary and key secondary endpoints. It showed that the subcutaneous administration of casirivimab and imdevimab reduced the risk of symptomatic infections by 81% in those who were not infected when they entered the trial.