Dr. Peter Hotez has been proposing clinical trials of convalescent serum therapy for several weeks now. If it works it could potentially be used both to treat infected patients, and reduce the risk of infection for healthcare workers.
I don't know if Dr. Hotez is directly involved, but St. Luke's, which is a Houston-based hospital heavily affiliated with BCM/TCH (where Dr. Hotez works), started trialing this in patients a few days ago.