China conducted out 11 million coronavirus tests in just five days in the eastern coastal city of Qingdao after new cases were recorded last weekend.
The cluster of 13 contaminations was traced to a CT scan room at the Qingdao Chest Hospital, state-run daily Global Times reported.
Authorities discovered the room was utilised for COVID-19 patients and other patients without proper disinfection, officials said.
While the hospital was designated for treatment of overseas COVID-19 patients, two infected individuals found to be at the source of the new cluster were workers at the Qingdao port.
The medical facility has been closed since last Sunday.
Mass nucleic testing in the city of over 11 million began on Monday and was completed by Friday.
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