CHINA / SOCIETY By Global Times Published: Jun 09, 2021 07:02 PM People have their information registered before COVID-19 nucleic acid testing in Liwan District of Guangzhou, south China's Guangdong Province, June 8, 2021. A new round of mass testing in high-risk areas of Baihedong Street and Zhongnan Street in Guangzhou started on Tuesday.(Photo: Xinhua) Virus-hit Guangzhou has become the city with the largest nucleic acid testing program in the world, with more than 16 million people tested in about two weeks. New technology can test mutated virus variants in no more than one hour. As of June 5, Guangzhou has collected more than 16 million samples of nucleic acid tests, surpassing Ho Chi Minh in Vietnam to become the world's largest scale nucleic acid testing city, data from the city's health commission showed.