A medical staff takes a swab from a woman as residents receive the Covid-19 test near the residential area in Qingdao in east China's Shandong province.
Sui Zhenhua, director of the Qingdao municipal health commission, was suspended following the resurgence of the virus, according to a decision made by the Qingdao municipal committee of the Communist Party of China on Wednesday.
No additional COVID-19 cases have been reported in Qingdao as of Tuesday, following an outbreak of new cases that appeared over the weekend, officials said, adding that over 4.2 million people in the city have been tested out of its 9 million population.
Authorities have not shared details of the other four, but said Thursday that all cases in the city are "closely linked" to the hospital. Testing began with "close contacts, close contacts of those close contacts and more casual contacts", gradually expanding to all districts of the city, Qingdao's health department said.
China, where the coronavirus was first discovered at the end of previous year, eradicated most of the virus at home, but is on the lookout for import cases and the second wave of domestic spread.
Over 5.41 million of the samples collected have been tested to date, and with the exception of the cases already reported, no new positive samples have been found, the city government information office told a press conference on Wednesday. The other case listed as asymptomatic was discovered on September 24 and reclassified as confirmed case.
China has reported 4634 deaths among 85,622 cases of the disease.