"Dynamic clearing" is equivalent to sealing control?

Wu Zunyou, chief scientist of China CDC

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 development

With the changes in the global epidemic situation, especially the rapid spread of Omicron mutant strains, many hidden spreads, and difficult prevention and control, and foreign prevention and control effects are not ideal, many countries reluctantly chose to "lie down"

1.

"Clearing" is the process of going from existence to non-existence, that is, the process of eliminating the epidemic

"Dynamic" means that the outbreak and clearing of the epidemic are constantly changing

The fundamental purpose of dynamic clearing is to find an epidemic, put out an epidemic, and prevent the epidemic from "taking root" locally

2.

The new coronavirus can only sustain its long-term survival if it continues to spread from person to person

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

When there is no local continuous spread of the new crown epidemic, and the local 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, China has basically eliminated the new crown virus epidemic

Generally speaking, the earlier the epidemic is discovered, the smaller the scope of its spread, and the easier it is to achieve dynamic clearing

3.

4.
The 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, early isolation, and early treatment, which are the so-called "four early" measures
.

In the "foreign import prevention" prevention and control measures, the first is to emphasize the isolation and observation of inbound personnel, so as to timely detect infected persons entering overseas; the second is to emphasize the daily monitoring of people involved in overseas cold chain or cargo transportation, and timely detection of "human-to-human transmission" "The subsequent "human-to-human transmission"
.
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 prevention and control measures of "internal rebound", the first is to strengthen the control of the movement of people in the new crown epidemic area, strictly prevent the outflow of infected people, and bring the new crown epidemic to 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
.

5.
Misunderstanding 1 of dynamic clearing: zero infection

Dynamic clearing does not mean 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, 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 eliminated within a relatively short period of time
.

Dynamic clearing emphasizes the clearing of infected people at the social level, and does not require 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.
Dynamic Clearing Misunderstanding 2: Sealing and Controlling

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 found 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 measures are only used when the epidemic is detected late, or, although it was discovered earlier, but failed to take decisive measures to control it in time, and there has been more community transmission
.

7.
Dynamic clearing of misunderstanding 3: Nucleic acid testing for all staff

Some people equate the measures of dynamic clearing with nucleic acid screening measures for all staff.
When it comes to dynamic clearing, they think of nucleic acid screening for all staff in the city
.
Similarly, as long as the epidemic is discovered 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
.

Nucleic acid screening measures for all staff are only used when the epidemic is detected late, or when decisive measures have not been taken to control it in time, there has been more community transmission, and the chain of transmission is unclear
.

8.
Dynamic Clearing Misunderstanding 4: Affecting the Economy

When some people mention dynamic clearing, they think of a great impact on the economy
.
In fact, dynamic clearing can maximize the escort for economic construction
.

If the epidemic is found in the first generation, controlled in the first generation, and eliminated in the first generation, it will have no impact on economic construction, and can only provide a safe environment
.

If the epidemic is detected earlier, such as the second or third generation of the epidemic, it will have no impact on economic development
.

If the development of the epidemic situation is more severe, it is necessary to take a wide range of nucleic acid screening for all employees, containment 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 zero-clearing strategy on the local GDP is only half of the economic impact of the non-dynamic zero-clearing strategy
.