Is it necessary to isolate the time-space intersection of epidemics? Is the intersection of time and space closely connected?

Is it necessary to isolate the time-space intersection of epidemics?

Close contact with infected people or crossing time and space can be judged as close contact or sub-close contact.

"Time-space intersection" is a technical term of public security and telecommunications departments. Space-time intersection and space-time accompaniment are the same concept, which means staying in the same space-time grid (800 m× 800 m) with the diagnosed patient within 14 days 10 minutes. In layman's terms, it is crossed with the travel trajectory of the confirmed patient 14 days. No matter whether the communication signal drifts or passes by, it may be considered as a time-space intersection crowd.

After being judged by the system as a time-space intersection, the health code will turn yellow. For such people, it is necessary to carry out nucleic acid detection twice every three days and stay at home again. As long as it is negative, the green code can be restored.

In other words, the intersection of time and space will lead to the yellow code of health code, which needs to be isolated at home.