Hospitals are gearing up to test if a century-old treatment used to fight off flu and measles outbreaks in the days before vaccines, and tried more recently against SARS and Ebola, just might work for COVID-19, too: using blood donated from patients who’ve recovered. Now a network of U.S. hospitals is waiting on permission from the Food and Drug Administration to begin large studies of the infusions both as a possible treatment for the sick and as vaccine-like temporary protection for people at high risk of infection. “We won’t know until we do it, but the historical evidence is encouraging,” Dr. Arturo Casadevall of Johns Hopkins University’s school of public health told The Associated Press.
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