Legal analysis: Close contacts should be observed in isolation medicine, and special groups such as infants and semi-self-care people who do not have the conditions, or can be observed at home under the guidance of community medical personnel. In addition, hotels and schools can be requisitioned as centralized isolation observation points according to relevant requirements for the selection and requirements of centralized isolation observation sites. Close contacts refer to people who have close contact with suspected and confirmed cases of the virus and have not taken effective protection two days before symptoms appear, or two days before samples of asymptomatic infected people are collected. Including * * * the same resident, medical staff in medical activities that may produce aerogel environment, people who eat or entertain in a closed environment, people who have close contact in the same place, people who visit cases, other forms of direct contacts, such as the accompanying person of the case, nursing or peers who have close contact with the same vehicle (within 1 m), people who are in contact with the environment and articles contaminated by cases or asymptomatic infected people.

Legal basis: Judgment and management of close contacts of the Comprehensive Group of Joint Prevention and Control Mechanism for the State Council's Response to novel coronavirus Epidemic on Printing and Distributing the Prevention and Control Plan of novel coronavirus (III). According to the results of epidemiological investigation,

Public health professionals should make scientific judgments on close contacts and close contacts, and transport them to centralized isolation places for medical observation within 12 hours. Centralized isolation of medical observation close contacts 14 days. On the first 1, 4th, 7th and14th day of scientific observation, the nucleic acid was detected respectively. After isolation, family health monitoring was carried out for 7 days. During the period, do a good job in monitoring body temperature and symptoms, reduce the amount of activity, do personal protection when going out, do not participate in gathering activities, and conduct a nucleic acid test on the second and seventh days respectively. The observation period and centralized isolation period of close contacts are determined according to the results of nucleic acid detection of close contacts. During the isolation medical observation, the first two nucleic acid tests of close contacts were negative, and the nucleic acid tests of close contacts were negative on days 1, 4 and 7, so the isolation medical observation can be lifted on the seventh day. If the previous two nucleic acid tests of a close contact are positive, the close contact shall be managed as a close contact until the expiration of 14 days.