On the evening of April 18, Wu Zunyou, chief expert of epidemiology at the Chinese Center for Disease Control and Prevention, issued an article explaining the “dynamic clearing” Zero and related misunderstandings”:
The full text is as follows: strong>
Over the past two years, my country has not only successfully controlled the new crown epidemic, but also contributed to the society Stability and economic construction provide environmental guarantees. my country’s phased achievements in the prevention and control of the new crown are due to the strong leadership of the Party Central Committee, the general strategy of “foreign defense against imports, internal defense against rebound” and the general policy of “dynamic clearing” are correct, and the third is due to the broad masses of the people. The masses are actively participating in the fight against the epidemic.
As the global epidemic situation changes, especially The spread of strains is fast, there are many hidden spreads, and prevention and control are difficult. The prevention and control effects abroad are not ideal. Many countries have no choice but to “lie down”. Recently, my country has also experienced a complex epidemic situation that is multi-faceted and wide-ranging. Some people in China have no confidence in continuing to insist on “dynamic clearing”, and some even confuse “dynamic clearing” with “zero infection”, believing that “dynamic clearing” is impossible to achieve in view of the new epidemic situation at this stage. To this end, with the help of the Weibo platform, we will introduce the basic principles of the role of “dynamic clearing” in the prevention and control of the new crown epidemic, as well as various misunderstandings in the society.
1. Dynamic clear meaning strong>
“Dynamic clearing” consists of two words “clearing” and “dynamic” composition.
“Clearing” is the process from having process of eradication. However, this eradication only refers to a certain epidemic that occurred at a certain time in a certain place, and does not refer to the general epidemic situation across the country in a broad sense.
“Dynamic” means that the outbreak and reset of the epidemic are constantly changing. For example, if an epidemic in place A is eliminated, another epidemic may occur in place B; if the epidemic in place B is extinguished, there may still be an epidemic in place C. In other words, the epidemic in place A was extinguished, and after a period of time, another epidemic occurred in place A, or a new epidemic occurred for the third, or even the fourth or more times, but there was no direct transmission relationship between these epidemics. . After each outbreak, it can be extinguished in a relatively short period of time, making the epidemic return to zero.
The fundamental purpose of dynamic clearing is to find an epidemic and put out an epidemic, Don’t let the epidemic “take root” locally.
2. Conditions for dynamic clearing< /strong>
After a person is infected with the new coronavirus, after about 1-2 days of the virus After replication and growth, the virus begins to be excreted from the body (ie, the nucleic acid test is positive), and it lasts for about 7-12 days. When an infected person excretes the virus from the body, they become contagious and can transmit the virus to others.
The new coronavirus can only be prevented by continuous human-to-human transmission maintain its long-term survival. If the infected person cannot spread the virus to other people beyond the maximum detoxification time, the virus will be eliminated by the body’s immune function.
Find out all infected people in an epidemic and take physical isolation , limit its contact with others, prevent it from spreading the virus to others, and maintain a maximum detoxification time, the virus is eliminated at the location of the epidemic.
There is no local continuous transmission of the new crown epidemic, and the local new crown epidemic mainly comes from In the case of overseas incoming, the dynamic clearing strategy is the best choice.
After obtaining control of the new crown epidemic in Wuhan, my country has basically eliminated the new crown virus epidemic. The subsequent outbreak of the new coronavirus spread locally, all imported from abroad. In other words, in the vast majority of our country, during the vast majority of time, our country is clean and free of the new coronavirus. Therefore, the dynamic clearing strategy is the best choice for my country’s new crown prevention and control.
Generally speaking, the early detection of the epidemic has The easier it is to implement dynamic clearing. Even if a certain proportion of community transmission occurs, with the county (district) as the basic unit, as long as the number of counties (districts) with community transmission of the new crown epidemic accounts for a small proportion of the total number of counties (districts) in the country, dynamic clearing can be achieved. of. If these counties (districts) with community transmission are scattered in 31 provinces, autonomous regions and municipalities across the country, dynamic clearing is relatively easy to achieve; if these counties (districts) with community transmission are concentrated in certain provinces, autonomous regions and municipalities, Dynamic clearing will be more difficult and will take longer.
3. Dynamically cleared soul
The soul of dynamic reset is to discover early, control early, and eliminate every epidemic in the bud. Don’t let the epidemic take root locally. Minimize the threat of the epidemic to people’s health and safety, as well as its impact on social stability and economic development.
4. Main measures of dynamic clearing
The core of dynamic clearing is to cut off the transmission chain.
The main measures for dynamic clearing include early detection, early reporting, and early isolation , Early treatment, the so-called “four early” measures.
In the prevention and control measures of “foreign import”, the first is to emphasize entry Personnel quarantine and observation in order to timely detect infected persons entering from abroad; the second is to emphasize the daily monitoring of persons involved in overseas cold chain or cargo transportation, and to detect the “human-to-human transmission” secondary to “human-to-human transmission” in a timely manner. These two measures are aimed at finding the imported epidemic situation in the first generation of cases and controlling the epidemic situation in the first generation of cases. This is the highest state of dynamic clearing.
In the “internal anti-rebound” prevention and control measures, the first is to strengthen Control the flow of people in areas affected by the new crown, and strictly prevent the outflow of infected people, bringing the new crown epidemic into non-epidemic areas, causing new epidemics. The second is to strengthen the monitoring of outpatient visits, and conduct nucleic acid testing for patients with fever, cough and other suspected new crowns or colds; those who do not have the conditions to do nucleic acid can use antigen screening to detect early cases in time. Third, people who have symptoms such as throat swelling or pain, cough, etc., can use the antigen screening method for self-test. If they find positive, they should report to the local epidemic prevention department in time for proper disposal. These three measures are all effective methods for early detection of the epidemic, and provide a guarantee for the early detection of the epidemic for the realization of dynamic clearing.
5. Dynamic clearing misunderstanding 1: zero infection span>
Dynamic reset is not equal to zero infection, which is essentially the same as zero infection difference. Dynamic clearing refers to the discovery and elimination of the new crown epidemic that occurred, so as not to let the new crown virus spread in the epidemic area, but also to prevent the virus from spreading from the epidemic area to other areas.
Dynamic reset does not pursue zero infection, but it needs to eliminate an epidemic , and requires timely interruption of transmission in the location of the epidemic, and no new infections occur. In other words, the country is not required to be free of new crown infections at a certain moment, but for every outbreak that occurs, it is required to be extinguished in a relatively short period of time.
Dynamic clearing emphasizes the clearing of infected people at the social level, and does not require There are no infected people in the location of the outbreak. The so-called social level clearing means that there are no infected people among the people who are freely active in the society. It does not matter even if there are a certain number of infected people among the people under quarantine management, because they are in a state of isolation and will not spread to the society. For example, in Adi, 100 new crown infections were found in nucleic acid screening, of which 50 were from outpatient screening and community screening, and the other 50 were from close contacts under quarantine observation. Then, A land has not reached the social level to be cleared. In the second place, 200 new crown infections were found in the nucleic acid screening, but all the infected people were from the quarantine observation group, and no infected people were found in the community screening and the outpatient screening, then the second place will be realized. If there is no infection at the social level, as long as no infected person is found in the community screening and outpatient screening for the longest period of detoxification (indicated by nucleic acid detection) or the longest incubation period (indicated by confirmed cases), Dynamic clearing is achieved.
6. Misunderstanding 2 of Dynamic Clearance: Seal Control span>
Some people take the measures to clear the dynamic, and the measures to block and control Equivalently, when it comes to dynamic clearing, it thinks of the city-wide lockdown. The measures taken for dynamic clearing depend on the stage of detection of the epidemic. If it is discovered early, it is only necessary to isolate and treat the patients, and isolate and observe close contacts to achieve clearing. For example, in the past two years, there have been 12 new crown epidemics in Shanghai. The maximum number of cases in each epidemic did not exceed 25. It was controlled and cleared, and no containment measures were taken at all. Containment and control measures are only used when the epidemic is detected late, or, although it was detected early but failed to take decisive measures to control it in time, and there is more community transmission.
7. Dynamic Clearing Misunderstanding 3: Nucleic Acid Detection for All Staff
There are also some measures to clear the dynamic, It is equivalent to the nucleic acid screening measures for all employees. When it comes to dynamic clearing, nucleic acid screening for all employees in the city comes to mind. Similarly, as long as the epidemic is detected early, the transmission chain is clear, and close contacts are found along the transmission chain, there is no need to conduct nucleic acid screening for all staff.
Only when the epidemic is discovered late, or, although it was discovered earlier but failed Take decisive measures to control it in a timely manner, and only use nucleic acid screening measures for all employees when there is a lot of community transmission and the transmission chain is unclear.
8. Dynamic Clearing Misunderstanding 4: Affecting the Economy span>
Some people think of economic big influence. Actually, dynamic clearing, in order to maximize the escort for economic construction.
If the epidemic is found in the first generation, controlled in the first generation, eliminated In the first generation, there is no impact on economic construction, but only to provide a safe environment.
If the epidemic is found early, for example, it is found in the second Generation or third generation has no impact on economic development.
If the epidemic situation develops more severe, it is necessary to take a large-scale comprehensive Nucleic acid screening of employees, closure and control measures, etc., the dynamic clearing strategy does have a certain impact on economic development. According to the preliminary analysis of mathematical model experts, the impact of the dynamic reset strategy on the local GDP is only half of the economic impact of the non-dynamic reset strategy.
Source: Fingertip Shenyang
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