The CDC surveyed 292 people who tested positive for the virus, and 35% said they still weren't back to their usual good health even two or three weeks after testing positive.
While older people were more likely to feel prolonged symptoms, even young adults without underlying conditions reported feeling unwell for a long period of time, the CDC said.
The new understanding into how the virus affects patients comes as more than 4.1 million cases of coronavirus cases and 145,539 deaths have been reported in the US, according to data from Johns Hopkins University.
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