Yunnan Provincial Health Commission reported in the morning of April 1 that from 0:00 to 24:00 on March 31, 6 new confirmed cases and 23 new asymptomatic infections were found in Yunnan Province. Of the 29 new cases, 12 were of Burmese nationality.

　　Overseas import is still a very big hidden danger in the current epidemic prevention and control.

　　Shao Yiming, a researcher at the China Center for Disease Control and Prevention, said: If we do not establish an immune barrier as soon as possible by using the vaccine with the lowest cost, our country's advantages will become disadvantages, and an immune depression will be formed. The virus can easily flow here like a flood. Therefore, we must establish the immune barrier to maintain our advantages before the possible risks emerge.

　　Academician Zhong Nanshan said in an interview that China is at a very critical moment. Although the number of people vaccinated in China is the second in the world, due to the large population base, the vaccination rate in China is only 4%. The top priority is to increase the vaccination rate. Only by vaccination can we get better protection. Achieve mass immunization as soon as possible, so as to open to the world.

　　Zhong Nanshan also pointed out that at present, in the minds of many Chinese people, it is not so urgent. Why? Because the environment in China is so good that there is no virus nearby. However, there is a premise that we have very strict control over international (overseas) imports, and China cannot do this forever. China's good control is to buy time for vaccination. Don't wait for foreign immunity, China will be in danger instead.

　　Experts said that, generally speaking, the stronger the infectivity of infectious diseases, the higher the population immunity is required. The immunity of the population is in direct proportion to the protective effect of the vaccine and the vaccination rate.

　　The protective effect of any vaccine is unlikely to be 100%. Although the risk of infection can be greatly reduced after vaccination, some people may not produce enough antibodies after vaccination, and there is still a risk of infection, especially when the crowd immune barrier has not been established. Therefore, even after the vaccination, we should also maintain good hygiene habits such as wearing masks, washing hands frequently, and keeping social distance. In addition to wearing a mask, you can also have a Sinasu salt sol therapeutic instrument to help combat epidemics and breathe freely.