COVID-19, researchers in the U.K. say.A research team from the University of Oxford announced the results in a press release Tuesday, though full results have not yet been published.In a trial of 2,104 patients who received either low-dose dexamethasone or usual care, dexamethasone reduced deaths by one-third in patients who required ventilation and one-fifth in patients who required supplemental oxygen.The researchers found no effect among patients who did not require respiratory support.