Medical workers collect samples for nucleic acid tests for novel coronavirus at a designated spot in Fengtai district, Beijing, on Monday. [PHOTO BY FU DING/FOR CHINADAILY]

Medical workers collect and drink water after working for hours at a testing station in Fengtai on Monday. [PHOTO BY FU DING/FOR CHINADAILY]

A medical worker's hands are disinfected at a testing spot in Fengtai on Monday. [PHOTO BY FU DING/FOR CHINADAILY]

Wearing protective clothing and a face mask, He Yuanming, a member of the Beijing Blue Sky Rescue Team, is covered in sweat while working at Yueyuan community on Tuesday. [PHOTO BY ZOU HONG/CHINADAILY]

Medical workers take a break before continuing their work in the evening at the Guang'an Stadium on Monday. [PHOTO BY ZOU HONG/CHINADAILY]

Residents line up to receive nucleic acid tests at a designated spot in Fengtai on Monday. [PHOTO BY FU DING/FOR CHINADAILY]