What are the health regulations for coming to Shanghai and returning to Shanghai?

According to the health code, coming to Shanghai and returning to Shanghai means that a person goes to Shanghai from other provinces and cities. Shanghai is the abbreviation of Shanghai, and coming to Shanghai refers to people living in other provinces and cities. Those who come to Shanghai to work, study, travel or settle down are called coming to Shanghai. Going back to Shanghai is more complicated. First, I am a person who lives in Shanghai and has a Shanghai household registration. Those who return to Shanghai after working, studying and traveling in other provinces and cities are called returnees.