On the 6th, at a press conference held by the Joint Defense and Joint Control Mechanism of the State Council, Song Yueqian, deputy director of the Health and Quarantine Department of the General Administration of Customs, introduced that the customs carried out nucleic acid sampling and testing for all inbound passengers. From April 1, the customs and local governments will cooperate closely to implement nucleic acid sampling and testing for all passengers entering through air, water and land ports, and transfer all personnel and their information to the joint defense and joint control mechanism at the port location. Medical treatment or unified centralized isolation measures to ensure seamless docking and closed-loop operation.