In epidemic prevention and control, people are generally divided into four types. First, the first one is what people often see in the media. We have met people called close contacts and close contacts. Now our country's scheme has also been upgraded to dense connection, that is to say, there is a circle around the object of dense connection, which is called dense connection and second dense connection.
The third object is general contact. Ordinary contacts can not reach the definition of close contacts, but such people may become patients if they are not controlled, so we call these people ordinary contacts. The first three types of personnel are our main targets.
Set purpose
The purpose is to refine the traceability investigation, strengthen isolation control, expand the scope of screening and prevent the epidemic from rebounding and spreading.
Enable the second and third secret screening, because of the particularity of COVID-19, if the cases are asymptomatic and asymptomatic in the early stage, then a secret is not known that they have been infected, and the second and third secrets may be infected, so it is necessary to find them one by one.
Comprehensively and quickly check relevant contacts, ensure that every time, every action track, every car and every colleague are clearly checked, ensure that the transmission route is effectively cut off, and prevent the spread of the epidemic.