The concept of "space-time intersection" is the same as that of "accompanying space-time", which refers to the person who stays with the diagnosed patient for 14 days and * * * stays 10 minutes in the same space-time grid (usually 800 m× 800 m as the detection range).
Space-time partners need to do nucleic acid twice within 72 hours, and the interval between the two tests needs 24 hours. The test results will be reported to the community where he lives. If the nucleic acid test is not carried out as required, the personal health code will be changed to red. After submitting the negative nucleic acid certificate online, the relevant staff will review it. After approval, the code will change back to green code within 7 working days.