More than four million coronavirus test swabs have been taken in a matter of days in Qingdao, the Chinese port city where a minor outbreak elicited a sweeping health response.
Authorities detected six virus cases on the weekend and swiftly swung into action to head off a wider outbreak.
The city is aiming to test its entire population — around 9.4 million — within five days of the detection of the first cases at a hospital on Sunday.