When will China resume normal personnel exchanges？ Is COVID-19 vaccinated every year？ Zhang Wenhong made the latest judgment.

　　On June 3rd, the 2nd General Assembly of Global Health Forum of Boao Forum for Asia was held in Qingdao, with 20 sub-forums, 4 salons and many important activities. Around the hot topics of public concern, such as epidemic prevention and control, vaccination, etc., many experts, including Zhang Wenhong, Zheng Zhongwei and Li Lanjuan, who came to the meeting, discussed and exchanged ideas and made the latest judgments.

　　When will the world resume normal personnel exchanges? Will COVID-19 be vaccinated every year like the flu vaccine in the future? In response to these public concerns, Zhang Wenhong, director of the Infectious Diseases Department of Huashan Hospital affiliated to Fudan University and director of the National Center for Infectious Diseases, gave his latest judgment at the relevant sub-forums of the Boao Forum for Asia Global Health Forum: "The conditional resumption of contacts in the world will begin in the second half of this year. We hope that China can conditionally resume contacts with some countries in the first half of next year, depending on the vaccination speed. In the end, whether we need to vaccinate repeatedly depends on how many people are infected or relapse after vaccination at the end of the second year. "

　　Recently, there have been new confirmed cases or asymptomatic infected people in many parts of the country. The epidemic situation is characterized by rapid spread and strong spread of strains, and the situation of epidemic prevention and control is still grim. Li Lanjuan, an academician of China Academy of Engineering and director of the State Key Laboratory of Infectious Diseases Diagnosis and Treatment, said in an interview that at present, we cannot relax our vigilance in epidemic prevention and control. Finding and controlling the source of infection, cutting off the route of transmission and protecting susceptible people are the three most important tasks: "We should test people and seafood from outside, and if we find them isolated, it will not spread. Often found in time, it will spread in a local area. We must continue to strengthen the control of imported epidemics. "

　　Vaccination is the most effective way to protect susceptible people. According to the latest data from National Health Commission, as of June 2nd, China has received more than 700 million doses of COVID-19 vaccine. Academician Li Lanjuan said that to establish an effective group immunity barrier, it is necessary to continue to promote large-scale vaccination. She said that she had received two injections of COVID-19 vaccine, and specially tested the antibody: "Although vaccination has been carried out on a large scale (at home), it has not reached the level of immune barrier. Only when 70% people are vaccinated and an immune barrier is established can a relatively large-scale epidemic not occur. Therefore, we must continue to increase the intensity of vaccination. "

　　(Reporter from the General Desk, Mou Wei, Yu Tingting, Wang Wei, Luo Wei)