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What is used to treat covid-19? Not even doctors are sure.

For most of April, Marylu Seidel felt like she was starring in a science fiction movie. Her husband of 34 years, Jeff, was sedated in an intensive care unit more than an hour’s drive away in Madison, Wis., and her only window into his world was a daily phone call with his nurses. His doctors, first at a local community hospital and then at the University of Wisconsin Hospital and Clinics, tried everything to help Jeff defeat the novel coronavirus — a ventilator, an antibiotic, an antimalarial drug, blood thinners, a blood plasma transfusion.