Tuesday, February 25, 2020 NIH Clinical Trial of Remdesivir to Treat COVID-19 Begins NIH has begun a clinical trial to evaluate the safety and efficacy of the investigational antiviral remdesivir in hospitalized adults diagnosed with COVID-19. The trial has enrolled a participant at the University of Nebraska Medical Center (UNMC) in Omaha. The study can be adapted to evaluate additional investigative treatments and to enroll participants at other sites in the U.S. and worldwide.