Researchers in England say they have the first evidence that a drug can improve COVID-19 survival: A steroid called dexamethasone reduced deaths by up to one third in severely ill hospitalized patients. Results were announced Tuesday and researchers said they would publish them soon. The study is a large, strict test that randomly assigned 2,104 patients to get the drug and compared them with 4,321 patients getting only usual care. The drug was given either orally or through an IV.