What is the intersection of time and space?

Time-space intersection refers to the person who stays with the diagnosed patient in the same time-space grid (usually 800 m× 800 m as the detection range) 14 days * * * stay 10 minute.

In layman's terms, for example, if the patient has been to a certain place within 14 days, the trajectory of you 14 days intersects with him. Whether it is a physical brush or a drift in communication signals, it may be considered as a space-time companion.

Experts said that screening "time-space companions" can find potential risk groups to the greatest extent, and include more people who are "time-space overlapping" and may be infected in key investigations, so as to truly achieve early detection and early prevention and control.

Under normal circumstances, the identified time and space companions will be further investigated to clarify the exact way, specific time and actual distance of time and space companionship, and to judge the risk of infection.

If it has been screened clearly, it is neither a secret contact nor a sub-secret contact, then there is no risk of COVID-19 infection.