The first US coronavirus patients are being treated with convalescent plasma therapy. Will it work? Not even the doctors know.

Whether the plasma, derived from the blood of people who have recovered from COVID-19, will help them fight off the devastating disease caused by the new coronavirus that has so far killed more than 5,100 Americans is still unknown. But, in less than three weeks, the effort to find out has gone from an idea to a worldwide program entirely self-organized by medical researchers.USAToday