From 0:00 to 24:00 on October 21, Xi'an added 3 new local confirmed cases (ordinary type), which are infected local cases in Xi'an except for members of the Shanghai tour group, which means that the already tense prevention and control situation is even more severe.
In the case trajectory released by the Shaanxi Provincial Health Commission, many people noticed a new word - the intersection of time and space. The locally confirmed case Shang and her husband Li X took the D2746 train (which intersected with the confirmed case 95 released by Gansu on October 19) to Lanzhou on October 15.
How should the so-called space-time intersection be understood? The relevant person of the disease control department said that this is the professional terminology of the public security and telecommunications departments, and the concept of time-space intersection population is used in the epidemic tracking, which can find potential risk groups to the greatest extent possible, and more people who may have the opportunity to infect because of the intersection of time and space into the circulation monitoring, which plays an important role in the timely detection of positive cases, of course, it also means that the workload of circulation is multiplied.
It is understood that the intersection of time and space is the same concept as another theory of spatio-temporal accompaniment, which means that within 14 days, it stays for 10 minutes in the same time and space grid with the confirmed patient (usually 800 meters * 800 meters as the detection range). In layman's terms, for example, the confirmed patient has been to Fuzhou within 14 days, and your trajectory in the past 14 days has intersected with him, whether it is a physical passing, or a drift in communication signals, it may be identified as a space-time accompaniment. After the system detects that you have a spatio-temporal accompaniment with the confirmed patient, and belong to the spatio-temporal companion in the risk population, the health code will turn yellow. How does the yellow code of the space-time companion turn to the green code? Nucleic acid testing is performed as required, and the health code returns to normal after the result is negative.
Due to the concept of the intersection of time and space in the prevention and control of the epidemic, some citizens have also included risk management although they have no direct close contact with confirmed cases or close contacts. On October 22, someone received a text message from the Xi'an Epidemic Prevention and Control Headquarters. The content of the text message is as follows: [Xi'an Epidemic Prevention and Control Command] Warm tips: Hello, in the new crown pneumonia epidemic transmission investigation, it was found that you were in a risk place, please take the initiative to do safety protection, and immediately go to the nearest nucleic acid testing point for nucleic acid testing. Thank you for your understanding and support! It is understood that for this part of the population, it is necessary to conduct nucleic acid testing in time, and after the nucleic acid test is normal, the health code will return to green.
Huashang Daily reporter Li Lin
Source: China Business Network - China Business Daily
Editor: Founder newspaper