Convalescent plasma study: two success stories Fri, 05/22/2020 - 12:00am The convalescent plasma study under way at Willis-Knighton Health System is proving to be an efficient treatment for Covid-19, a ...PLEASE LOG IN FOR PREMIUM CONTENT. Our website requires visitors to log in to view the best local news. Not yet a subscriber? Subscribe today! Read more about Convalescent plasma study: two success stories