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.
More than 30 patients in Hubei province, including Wuhan, have recovered from the disease but continue to test positive, said Jiao Yahui, an inspector at the National Health Commission, in an April 24 interview with the state broadcaster.
