Quarantine health observation was carried out on people coming to Shanghai from key areas without symptoms such as fever. For people who come to Shanghai, especially those in key areas, they mainly get information through three channels, one is the list pushed by big data, the other is the information pushed by various traffic intersections, and the third is the self-examination and self-arrangement of various districts, towns and villages in Shanghai. "During the isolation period, the relevant personnel must take temperature measurements twice a day. Once there are abnormal symptoms such as fever or acute respiratory infection, you must immediately transfer to a designated medical institution for treatment. " Zhu said, "After the expiration of the quarantine period, the community health service center that implemented the quarantine observation will issue the Notice for Key Personnel to Remove Health Observation.