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Medical staff wait to collect swab samples from residents for COVID-19 test in Qingdao, east China's Shandong Province, Oct. 14, 2020. [Photo/Xinhua]

Qingdao, a coastal city in east China's Shandong Province, has completed a citywide nucleic acid testing covering all its 11 million residents starting Monday, after a new cluster of local COVID-19 infections emerged.

As of 6 p.m. Friday, all of the over 10.89 million collected samples had been tested, and results showed no new positive cases, according to the municipal government.

The re-emerged infections have led to 13 new confirmed cases by Thursday. Inappropriate disinfection in the CT room at the Qingdao Chest Hospital was believed to be responsible for the infections.