The daily nucleic acid testing capacity of Beijing had surged from 100,000 to more than 230,000 as of Saturday amid efforts to contain the resurgence of domestically transmitted COVID-19 cases. (Photos: Xinhua)

A medical worker introduces the procedure at a nucleic acid testing site in Tongzhou District of Beijing, capital of China, June 22, 2020.

A medical worker collects a throat swab from a citizen at a nucleic acid testing site in Tongzhou District of Beijing, capital of China, June 22, 2020.

A citizen waits to be tested at a nucleic acid testing site in Tongzhou District of Beijing, capital of China, June 22, 2020.

A medical worker collects a throat swab from a citizen at a nucleic acid testing site in Tongzhou District of Beijing, capital of China, June 22, 2020.

A worker disinfects a nucleic acid testing site in Tongzhou District of Beijing, capital of China, June 22, 2020.