Wuhan has launched a city-wide testing campaign after confirming last weekend its first cluster of COVID-19 infections since its release from a virtual lockdown on April 8 to contain the spread of the pathogen.

The number of tests administered on May 15 in the city of 11 million residents was more than 50% higher than the 72,791 tests conducted a day earlier, and was also the highest since the Wuhan Municipal Health Commission started publishing the data on Feb 21.