A child takes the nucleic acid test at a testing post set up at a primary school in Dongxihu District in Wuhan, central China's Hubei Province, May 15, 2020. (Photos: Xinhua)

A resident takes the nucleic acid test at a testing post set up at a plaza in Wuhan, central China's Hubei Province, May 15, 2020.

Residents take nucleic acid tests at a testing post set up at a plaza in Wuhan, central China's Hubei Province, May 15, 2020.

Residents line up for nucleic acid tests at a testing post set up at a primary school in Dongxihu District in Wuhan, central China's Hubei Province, May 15, 2020.

Residents take nucleic acid tests at a testing post set up at a primary school in Dongxihu District in Wuhan, central China's Hubei Province, May 15, 2020.

A child takes the nucleic acid test at a testing post set up at a primary school in Dongxihu District in Wuhan, central China's Hubei Province, May 15, 2020.