Past Research on Convalescent Plasma Observational studies have suggested possible clinical efficacy and safety using convalescent plasma, primarily among patients who were not receiving invasive mechanical ventilation and those with shorter durations of illness.
Over the course of their illness, patients might have received , like the antiviral or the steroid.
I'm sure you're aware that the World Health Organization looked at this question of early use of convalescent plasma and decided not to recommend it on the basis of all the studies that were done in early December.
It may lessen the severity or shorten the length of the disease.