The proof of isolation is that you come back from a high-risk place in an epidemic area and report to the government. The government will give you an isolation certificate and isolate you. You will be isolated from shops and families. If you have contact with patients, go to a centralized isolation place designated by the government for a period of time. If you have just come back from an epidemic area to get nucleic acid, travel code and health code for 48 hours, you will be isolated at home.