On the Dec. 26th, Chinese Joint Prevention and Control Mechanism of the State Council issued the 《Overall Plan for the Implementation of "Class B and B Control" for New Coronavirus Infection. When it comes to optimizing the management of personnel exchanges between China and foreign countries, the plan proposes that personnel coming to China should undergo a nucleic acid test 48 hours before the trip, and those with a negative result can come to China without applying for a health code at the Chinese embassy or consulate abroad, and filling in the result in the customs health declaration Card. If positive, relevant personnel should come to China after turning negative.