Health codes are dynamic codes. If the applicant has ever taken a bus with a confirmed or suspected case, or comes from a key epidemic area, it will affect the color of the health code.
There are many sources of health code data collection, and everyone's mobile phone operation can basically be recorded. For example, the QR code of mobile payment, public transportation such as bus and subway, the GPS location information of users recorded by WeChat and Alipay in the background, and even the location information of base stations connected to mobile phones can all be used as data sources of health codes.
If there are confirmed patients at a certain time and on a specific occasion, then the system will judge the people who may have been exposed to these cases according to big data analysis, and the health code will "change color".
Principles of health laws and regulations
Once you scan the health code software with your mobile phone, it will immediately retrieve your mobile phone usage, vehicle usage and code scanning shopping, get your action trajectory and activity area some time ago, and then look at the degree of overlap with the action trajectory and activity area of confirmed cases or suspected cases, so as to judge whether you have been exposed to confirmed cases or suspected cases.
Then, the personal health code will be given, and there are three possible colors:
Green code: you can pass.
Code yellow: quarantine for 7 days. For 7 consecutive days, the health punch card was normal and turned into a green code.
Red team: quarantine 14 days. For 14 days, the health clock is normal and turns into a green code.
Therefore, to be on the safe side, try not to wander around and avoid entering unknown sensitive areas.