"Spatio-temporal concomitant" means that my phone number and the diagnosed number stay in the same spatio-temporal grid (the range is 800M*800M)*** together for more than 10 minutes and the cumulative length of stay of either number in the last 14 days is more than 30 hours or more, and the number detected is a spatio-temporal accompanying number.

At this time, my green health code will become a yellow code with a warning, and is marked by the system as a "space-time companion", and then will receive the Public Security Bureau, the city CDC text message reminder of the risk of space-time companion personnel should immediately report to the community, and within three days to carry out the nucleic acid test two times, two times the nucleic acid test interval should be be more than 24 hours, and please stay home and do not go out before obtaining a negative nucleic acid result.