What does COVID-19's time companion mean?

COVID-19's space-time companion refers to a person whose phone number and the number of a confirmed patient in COVID-19 stay in the same space-time grid (the range is 800 m * 800 m) for more than 10 minute, and the cumulative stay time of either number in the last 14 days exceeds 30 hours.

Space-time companion, a new term that gave birth to COVID-19 epidemic. Before the time-space companion, people who investigated the risk of infection in COVID-19 were managed by close contacts. Comparing their definitions, we can find that the biggest difference lies in the further expansion of their spatial scope.

Matters needing attention for space-time partners:

Health code yellow code personnel and time-space associated risk personnel who received SMS reminders from the Public Security Bureau and the Municipal Center for Disease Control and Prevention should immediately report to the community and conduct two nucleic acid tests within 3 days, with the interval between the two nucleic acid tests being more than 24 hours. Please stay at home and don't go out until you get a negative result of nucleic acid.

The current situation of space-time partners;

The government has no unified definition and management method for "time companion". In the information published in many places, time-space accompaniment, time-space intersection and time-space coincidence are all interpreted as a term, but the definitions published in different places are not uniform.

The above contents refer to Baidu Encyclopedia-Time Companion.