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Coronavirus: Medical mystery of recovered patients testing positive

Doctors are puzzled by some patients' longer process of viral shedding

High school students are tested for coronavirus in Hubei province, China. Some patients test positive for the virus after recovery.    © Reuters

Doctors and scientists are still grappling with the mystery of patients who continue testing positive for the COVID-19 virus weeks after recovery, even as China declared the pandemic's initial epicenter Wuhan free of cases.

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