On the evening of the 17th, Wu Zunyou, the chief epidemiologist of the Chinese Center for Disease Control and Prevention, posted on his personal social platform, expressing his views on the dynamic clearing and related misunderstandings.
Screenshot of Wu Zunyou’s personal social platform
The following is the full text:
Over the past two years, China has not only successfully controlled the COVID-19 epidemic, but also provided an environmental guarantee for social stability and economic construction. 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 import, internal defense 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.
The mutated Keron strain spreads quickly, spreads more hidden, and is difficult to prevent and control. The prevention and control effects abroad are not ideal. Many countries have reluctantly chose 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.
Data map: Medical staff are killing. Photo by Mingyan Ma
1. Dynamic clear meaning
“Dynamic clearing” consists of two words “clearing” and “dynamic”.
“Clearing” is the process from having to nothing , is the process of eliminating the epidemic. 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 are in ever-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 discover an epidemic, Fight an epidemic and prevent the epidemic from “taking root” locally.
2. Conditions for dynamic clearing
After a person is infected with the new coronavirus, after about 1-2 days of virus replication and growth, the virus begins to be excreted from the body (that is, the nucleic acid test is positive), and it continues for about 1-2 days. 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 is only constantly spreading from person to person. spread among them in order to maintain their 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 the infected people in an epidemic, Take physical isolation, limit their contact with others, prevent them from spreading the virus to others, and maintain a maximum detoxification time, and the virus will be eliminated at the location of the epidemic.
In the absence of local continuous transmission of the new crown epidemic, and local When the new crown epidemic is mainly imported from abroad, 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. Therefore, the dynamic clearing strategy is the best choice for my country’s new crown prevention and control.
Generally speaking, the earlier the outbreak is detected, the longer it will spread. The smaller the range, 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.
Data map: Nucleic acid testing conducted by medical staff in Qinghai Provincial People’s Hospital. Photo courtesy of Qinghai Provincial People’s Hospital
< span>3. Dynamically cleared soul
The soul of dynamic reset is to find out early, control it early, and eliminate every outbreak 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 of dynamic clearing include early detection, Reporting, early isolation, and early treatment are the so-called “four early” measures.
In the prevention and control measures of “external defense input”, The first is to emphasize the isolation and observation of inbound personnel in order to timely detect infected persons entering from abroad; the second is to emphasize the daily monitoring of people involved in overseas cold chain or cargo transportation, and to timely detect “human-to-human transmission” after “human-to-human transmission”. Both of these measures are aimed at detecting 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, First, it is necessary to strengthen the control of the movement of people in the areas affected by the new crown epidemic, strictly prevent the outflow of infected people, and bring 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, pain, cough, etc., can use the antigen screening method for self-testing. If they are found to be 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.
Data map: On April 18, Harbin, Heilongjiang, citizens showed a negative nucleic acid certificate within 48 hours when entering the community. Photo by China News Agency reporter Sun Hanlun
< span>5. Misunderstanding 1 of dynamic clearing: zero infection
Dynamic clearing is not equal to zero infection, which is essentially different from zero infection. 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.
Although dynamic clearing does not pursue zero infection, it must To achieve the elimination of an epidemic, it also requires timely interruption of transmission in the location of the epidemic, and no new infection occurs. 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.
The dynamic clearing emphasizes the clearing of infected persons at the social level. Zero, it is not required that there are no infected people in the location of the epidemic. 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 B site, 200 new crown infections were found in nucleic acid screening, but all the infected people were from the quarantine observation group, and no infected people were found in community screening and outpatient screening, then B site 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 clearing: sealing control
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Some people equate the measures of dynamic clearing with closure and control measures. When it comes to dynamic clearing, they think of the city-wide closure and control. The measures taken for dynamic clearing depend on the stage of epidemic detection. 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 people who equate the measures of dynamic clearing with nucleic acid screening measures for all employees. When it comes to dynamic clearing, they think of the whole city. Staff nucleic acid screening. 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 outbreak is detected late, or, although It was early but failed to take decisive measures to control it in time, and only when there was a lot of community transmission and the transmission chain was unclear, the nucleic acid screening measures for all employees were used.
8. Misunderstanding 4 of Dynamic Clearance: Affecting the Economy
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When some people mention dynamic reset, they think of a great impact on the economy. In fact, dynamic clearing can maximize the escort for economic construction.
One generation, eradicated in the first generation, has no impact on economic construction, but can only provide a safe environment.
If the outbreak is discovered earlier, such as The second or third generation of transmission has no effect on economic development.
The large-scale nucleic acid screening of all 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: China News Network, @ Wu Zunyou ChinaCDC