Beijing's Daxing District started the second round of mass nucleic acid testing on Tuesday in an effort to contain the latest COVID-19 resurgence. All the residents of the district, except those who are under centralized quarantine or home isolation, need to get tested in the second round. A total of 310 testing sites have been set up in 20 towns and sub-districts, and Z-park Daxing Bio-medicine Industry Park and a new media industry base have also been established in the district.