Staff members of Xuetianwan Community deliver masks to a resident in Yuzhong District, southwest China's Chongqing Municipality, Feb. 22, 2020. Staff members and volunteers of Yuzhong District have fulfilled their duty in the battle against the novel coronavirus outbreak. (Xinhua/Wang Quanchao)

A volunteer (R) of Shangdatianwan Community registers for a resident in Yuzhong District, southwest China's Chongqing Municipality, Feb. 22, 2020. Staff members and volunteers of Yuzhong District have fulfilled their duty in the battle against the novel coronavirus outbreak. (Xinhua/Wang Quanchao)