At the press conference on epidemic prevention and control in Guangzhou on April 15, Chen Bin, deputy director of the Municipal Health Commission and spokesman, introduced that carrying out multiple rounds of nucleic acid testing is an important way to detect potential infected people in the population as soon as possible. Since April 8, guangzhou districts have dispatched more than 90,000 medical personnel, implemented nucleic acid screening on a rolling basis, and sampled more than 64 million people, providing an important basis for judging the epidemic prevention and control situation and implementing accurate prevention and control.
In response to COVID-19,
Why adopt the multi-round crowd nucleic acid testing rolling model?
when and in what areas to conduct population nucleic acid screening,
What is the basis for the development of the detection strategy?
Let's take a look!
Citizens should receive nucleic acid testing sample scanning code registration in an orderly manner.
Experts from the Guangzhou Municipal Center for Disease Control and Prevention told reporters that at present, nucleic acid testing is still a powerful means to quickly find new crown pneumonia infections. Since for different infected people, the incubation period from infection to the onset of the virus is short, multiple rounds of screening are required to screen out people with long incubation periods. Through large-scale nucleic acid screening, the rapid detection of cases and infected people is conducive to achieving early detection, early isolation, early blocking, and minimizing the possibility of transmission. Therefore, it is necessary to carry out multiple rounds of large-scale nucleic acid testing for the early detection of new crown pneumonia cases and asymptomatic infected people, and the implementation of accurate prevention and control.
On the 7th of this month, Wu Zunyou, chief expert of epidemiology of the Chinese Center for Disease Control and Prevention, also said in a Weibo post that when the epidemic spreads widely at the community level, to achieve zero at the social level, nucleic acid testing for all employees is the most effective strategic measure, "nucleic acid testing for the purpose of zeroing, one should be fast, the other should be complete."
He further explained in the article that the average incubation period of the Omiljung strain is 3 days, and confirmed cases generally begin to excrete the virus from the body 1 to 2 days before the first symptoms appear, "that is, if a person has effective contact with a person infected with the new crown virus (that is, infected), the nucleic acid test is carried out on the same day or even the next day, the results are basically negative; the nucleic acid test on the third day is meaningful."
When the first round of full screening is completed, those infected people who are infected and have been detoxified outside the body can be screened out; those who are infected with the virus but have not yet been detoxified outside the body will be negative for nucleic acid in the first round of screening. These infected people who have not yet been detoxified will continue to stay in the community, and if they are not detected in time, they will soon develop into infected people who are detoxified outside the body and are contagious, and will continue to spread the virus in the community.
Therefore, a second round of screening must be carried out immediately after, with the aim of being able to screen the virus and cut off transmission before it can infect others. "Because the nucleic acid test is super sensitive, as long as there is a virus in the throat area, it can generally test positive. If an infected person tests negative and cannot collect the virus by sampling with a cotton swab, the risk of transmitting the virus to others within 24 hours by breathing or speaking is almost negligible. Therefore, the full screening must be fast, and the second, third, and fourth rounds of screening must be carried out one after another, round after round, and the social level can be cleared quickly. ”
On April 12, 2022, the fourth day of nucleic acid testing in Haizhu District was carried out at the nucleic acid testing point on Shayuan Street in Guangzhou, and the citizens praised the efficiency and order.
At the Guangzhou epidemic prevention and control press conference on the 15th, Chen Bin said that in the next step, each district will continue to carry out nucleic acid screening according to the characteristics of its own epidemic situation, and invite citizens and friends to participate in the nearest orderly manner on time in accordance with the notification requirements of the place of work or residence.
In the Guidelines for the Implementation of Regional Novel Coronavirus Nucleic Acid Testing Organizations (Third Edition) recently issued by the National Health commission (hereinafter referred to as the "Guidelines"), it is required that nucleic acid testing within the delineated area should be completed within 24 hours.
On the evening of April 11, the park front subway station Parkway Plaza, Guangta Street carried out the third round of nucleic acid testing at night.
The "Guide" also pointed out that it is necessary to scientifically determine the detection strategy, according to the flow traceability, close contact personnel push and other situations, research and judgment of the epidemic transmission trend, the first time scientific demarcation of the risk area and regional nucleic acid detection scope and dynamic adjustment, in principle, the first 3 days after the outbreak, carry out a round of regional nucleic acid testing every day to find out the potential risks of the social surface; then according to the comprehensive research and judgment of the flow traceability, community sealing and control scope, nucleic acid screening results, etc., to determine the scope and frequency of follow-up screening.
If the social risk is not controlled and the risk points are not clear, continue to carry out 1 round of regional nucleic acid testing every day. When the social risk is controlled and the risk point is basically clarified, according to the distribution of cases, the key areas can be divided into relevant streets, communities, and communities, and the key areas can be checked once a day, and the non-key areas can be checked every other day or 3 days according to the situation, and the test results are issued within the specified time as required. Gradually reduce the scope of nucleic acid screening, improve the accuracy of screening, and scientifically and accurately screen.
Note that large-scale nucleic acid testing is performed
These details should be done well
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Source: Guangzhou Daily
Editor: Jia Chen
Editor-in-charge: Chen Guangtai
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