One is the application of big data. The process of epidemiologic investigation uses big data to help sort out the entire chain of transmission and maximize the likelihood of finding all potentially infected people in the chain.

The second is nucleic acid testing, the so-called "whole-person nucleic acid testing". Nucleic acid testing is very important in terms of timeliness and comprehensiveness. In the determined local scope of the whole staff test, must be completed within a short period of time, preferably 1-3 days to complete a round of testing, must be fast. Each round of testing must complete the screening of the entire population within the determined localized scope, and must not screen part of the population and miss part of the population. If we can achieve timely screening of the entire population, generally speaking, 3-4 rounds of nucleic acid screening can basically achieve the clearing of cases at the social level, and we must pay attention to preventing any omissions. If every round is missed, there may be 7 or 8 rounds or 8-1 rounds done and still have social level infections found, so timely, rapid and comprehensive is very important.