Biden, who has isolated at the White House since testing positive for the coronavirus last Thursday, is a keen cyclist and has been reported to start his days with a workout that includes lifting weights.
The research, which was published in the Lancet medical journal and involved hundreds of patients in the Chinese city of Wuhan, is among the few to trace the long-term symptoms of Covid-19 infection.
Strange symptoms emerging in recovered Covid-19 victims had no medical explanations until now, and the research on it tells a grim tale.
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