Based on early reports, covid-19 appeared to be a standard-variety respiratory virus. But many doctors are now reporting bizarre, unsettling cases that don't seem to follow the textbooks they've trained on. They describe patients with startlingly low oxygen — so low that they would normally be unconscious or near death — talking and swiping on their phones. Asymptomatic pregnant women suddenly in cardiac arrest. Some scientists now hypothesize that at least some of these abnormalities may be explained by blood-clotting complications. | 
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