I only received a streaming message, but I didn't get a call.

Epidemiology is the abbreviation of epidemiological investigation, which refers to the investigation and research conducted by epidemiological methods. It is mainly used to study the distribution and determinants of diseases, health and hygiene events, and is an important measure to prevent and control infectious diseases and epidemics. Epidemiological investigation is an important work according to the Law of People's Republic of China (PRC) on the Prevention and Control of Infectious Diseases and the Emergency Regulations of Public Health Emergencies. It is the duty of every citizen to cooperate with epidemiological investigation.

Experts said that the purpose of epidemic control is to cut off the transmission route of the virus, protect others from infection and control the spread of the epidemic. It is to find out the action track, people and events of key population in the past certain period (according to the incubation period of the disease), obtain the health status of those who are in close contact with the case, and find out the exposure, contact, activity track and medical treatment. 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. If a citizen receives a call from the epidemic coordinator, it may be because you have been in close contact with a confirmed case or a nucleic acid positive person recently, but you don't know where you have been exposed, so the epidemic coordinator will ask you for relevant information to track the transmission route of the virus.