In a May 26 study in the journal Critical Care Medicine, Martin and a group of colleagues found that 35.7 percent of covid-19 patients who required ventilators died — a significant percentage but much lower than early reports that put the figure in the upper 80 percent range.

Use of drugs such as remdesivir, which shortens the recovery time for some of the sickest patients, and the steroid dexamethasone have helped as well.

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