If you pass through an epidemic area for a short time and don't use your mobile phone or surf the Internet during the process, the health code will generally not turn red. Crossing refers to stopping in relevant areas, including crossing medium and high risk areas by car, train and plane. If you are just passing by, the health code generally does not change color.
According to the data provided by the health department, four groups of people, namely, confirmed, suspected, close contacts and asymptomatic, will present the state of "centralized observation" in red team.
If you have recently been to a medium-high risk area or had close contact with relevant personnel, the health code will display yellow code status after these personnel are checked and included in community management.
The travel code indicates the city name of the middle and high risk area in red, but it has nothing to do with health status. If you pass through an epidemic area, the health code will not change color, but the words on the travel code may turn red.