How to understand "7-day residence history"?

You have a history of seven days. Generally speaking, you haven't been to a place in seven days. However, if the itinerary is determined according to the mobile phone number, sometimes the itinerary code will not be displayed because the stay time in a city is less than 4 hours. If you calculate according to the usual time, more than 24 hours is a day. But there is no very fixed time during the epidemic. If an epidemic case has just occurred in a place, do nucleic acid for yourself at the first time to ensure the health and safety of yourself and others.

? Stay history involving epidemic situation, travel and residence history involving epidemic situation. To put it simply, recently traveling and living in high-risk areas have experienced major animal epidemics, which means that animal epidemics with high morbidity or mortality, such as highly pathogenic avian influenza, suddenly occur and spread rapidly, posing a serious threat and harm to the production safety of aquaculture, and may cause harm to public health and life safety, including particularly major animal epidemics.

? According to Article 8 of the Law of People's Republic of China (PRC) on the Prevention and Control of Infectious Diseases, the state develops modern medicine and traditional Chinese medicine, supports and encourages scientific research on the prevention and control of infectious diseases, and improves the scientific and technological level of the prevention and control of infectious diseases. The state supports and encourages international cooperation in the prevention and treatment of infectious diseases.