Five-level linkage is implemented: namely, pairing assistance is carried out at five levels: county leaders, township (bureau) leaders, ordinary cadres and village cadres, social successful people and volunteers, and party organizations at all levels.

The full name of epidemiological investigation is epidemiological investigation, which is a very important work in the prevention and control of infectious diseases. Tracing the source of flow regulation is to explore the source of infectious diseases and follow the current to find the source.

The purpose of traffic adjustment: in the past period of time, the action track of key people, the people they met and what happened. To find out the exposure, contact, activity track and medical treatment of the case or the person who is in close contact with the case. Search for clues related to the source and route of infection and clarify the transmission chain, so as to provide basis for judging close contacts, taking isolation measures and delineating disinfection scope. Therefore, the adjustment of the epidemic situation is also to protect others from infection and control the spread of the epidemic.