Medical staff members take throat swab samples from people at a newly-adopted mobile testing vehicle in Xicheng District of Beijing, capital of China, June 28, 2020. (Photos: Xinhua)

A medical staff member takes a throat swab samples from a woman at a newly-adopted mobile testing vehicle in Xicheng District of Beijing, capital of China, June 28, 2020.

A medical staff member takes a throat swab sample from a woman at a newly-adopted mobile testing vehicle in Xicheng District of Beijing, capital of China, June 28, 2020.

A medical staff member takes a throat swab sample from a woman at a newly-adopted mobile testing vehicle in Xicheng District of Beijing, capital of China, June 28, 2020.

A medical staff member takes a throat swab sample from a man at a newly-adopted mobile testing vehicle in Xicheng District of Beijing, capital of China, June 28, 2020.

A medical staff member takes a throat swab sample from a man at a newly-adopted mobile testing vehicle in Xicheng District of Beijing, capital of China, June 28, 2020.

Medical staff members take throat swab samples from people at a newly-adopted mobile testing vehicle in Xicheng District of Beijing, capital of China, June 28, 2020.

A medical staff member takes a throat swab sample from a man at a newly-adopted mobile testing vehicle in Xicheng District of Beijing, capital of China, June 28, 2020.