The yellow code of health code is not necessarily infected with COVID-19 virus, and the yellow code is a warning color. As long as it is proved that COVID-19 is not infected, it is generally unnecessary to isolate people whose health codes show yellow codes, but it will restrict their travel to some extent. For example, people with yellow health code are not allowed to enter shopping malls, hotels, supermarkets, stations, airports, cinemas, KTV, bars and other public places. Therefore, if you find that your health code has turned into a yellow code, you must promptly report it to the relevant staff in the community, cooperate with the staff to do a good job in screening, and turn your health code into a green code as soon as possible.