Nurse Janet Gilleran prepares to treat COVID-19 patient Mike Mokler with bamlanivimab, a monoclonal antibody drug from Eli Lilly, at the Respiratory Infection Clinic of Tufts Medical Center in Boston on Dec. 31, 2020.

BOSTON – DECEMBER 31: Registered nurse Janet Gilleran prepares to treat coronavirus patient Mike Mokler with Bamlanivimab, a monoclonal antibody, in the Respiratory Infection Clinic at Tufts Medical Center in Boston, MA on December 31, 2020. Mokler said after a coworker tested positive recently for the coronavirus he began feeling symptomatic himself and tested positive soon after. Staff members were setting up for the distribution of monoclonal antibodies, a treatment for COVID-19. (Photo by Craig F. Walker/The Boston Globe via Getty Images)