Three new studies detail "long-haul" COVID-19, one finding 203 symptoms involving 10 organ systems, another showing that more than five coronavirus symptoms in the first week of infection portends a long disease course, and one finding few long-haul–like symptoms in children.

Average of 55.9 lingering symptoms

In the first study, published yesterday in the Lancet's EClinicalMedicine, a team led by University College London scientists analyzed survey responses from 3,762 COVID-19 survivors from 56 countries who still had symptoms 28 days after becoming ill.

Respondents had begun experiencing symptoms before June 2020 and were surveyed from Sep 6 to Nov 25, 2020. It is the largest international study of COVID-19 long-haulers to date, according to the authors, who tracked 66 symptoms for 7 months.

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