Staff members take samples to the health and quarantine comprehensive laboratory of Sichuan International Travel Health Care Center (Chengdu Customs Port Outpatient Department), in Chengdu, southwest China's Sichuan, Feb. 15, 2020. Since the outbreak of novel coronavirus pneumonia, novel coronavirus nucleic acid detection for incoming and outgoing travelers has become the primary task of the laboratory. Fifteen professionals formed an "anti-epidemic commando team", taking turns to their posts in groups everyday to ensure that samples are tested timely. (Xinhua/Liu Kun)