To date, more than 230 patients have received convalescent plasma across Nuvance Health’s seven hospitals. In early May, Nuvance Health opened convalescent plasma donation centers at Danbury Hospital, Norwalk Hospital and Vassar Brothers Medical Center to help critically ill patients with COVID-19. Danbury Hospital officials say with the development of a vaccine months, if not a year, away, medical institutions throughout the country have started trials to determine if plasma from recovered COVID-19 patients, when given to those that are severely ill, might be effective in decreasing the severity or duration of the disease. The program has close to 2,000 donors registered in its database.