After 56 days of tranquility, how does the new coronavirus enter the new market

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 After 56 days of tranquility, how does the new coronavirus enter the new market


National level experts 3 entering new places

At about 8:00 p.m. on June 17, a Chinese bus emergency started in the south area of the Institute of Virology, China CDC, located at 100 Yingxin street, Xicheng District, Beijing. Wu Guizhen, chief biosafety expert of China CDC and Secretary of the Party committee of the Institute of Virology, led a team of people to rush to the car and rush to the wholesale market of agricultural products in Xinfadi, where the outbreak was concentrated.

On the evening of June 12, China CDC dispatched 8 experts in epidemiology, infectious disease prevention and control and other fields to the expert group of the national health and Health Commission. Why do new cases appear suddenly after zero new cases in the past two months? Why does it happen in a wholesale market like Xinfadi? A series of questions await their answer.

According to the above report, on June 14, 15 and 17, experts from the Institute for Disease Control and virus disease entered the wholesale market of agricultural products in Xinfadi for three times.

For the first time, more than 200 samples were collected, many of which were positive for new coronavirus nucleic acid. The second time, more than 200 samples were collected in other areas, many of which were positive. For the third time, collect and test water systems such as market water, fish culture and preservation water, water channels and groundwater.

In the environmental sampling of Xinfadi market, there are many positive samples in its comprehensive trading hall, especially in the partial sales areas of aquatic products and bean products, which cause serious environmental pollution. Pang Xinghuo, deputy director of Beijing CDC, informed the sampling results at the press conference of Beijing Xinguan epidemic prevention and control on June 19.

Different positive samples point to different conclusions: it may point to the environment and the animals or objects inside it are the source of infection, or it may point to the people infected by the new coronavirus as the source of infection. For example, if positive samples are found in frozen products without Kaifeng, it further confirms the possibility of virus transmission through cold chain transportation to the market; if frozen products are after Kaifeng, it indicates that these frozen products may have been contacted before, then the result is Its not the same.

People to people or things to people?

At present, both possibilities exist.

Experts tend to think that it is the goods or people who bring the new coronavirus outside Beijing into the new birthplace, the all-around wholesale market of agricultural products.

It doesnt come from Beijing. It must be people or things outside Beijing who have brought the virus to the new place of origin. Wu Zunyou, chief epidemiologist of China CDC, revealed the latest judgment on the source of the new coronavirus in the new epidemic area in an interview with CCTV on June 19, the 9th day after Beijing reported the newly confirmed cases.

However, it is not clear what the people or things that bring the virus to the new place are.

Wu Zunyou said that if it is an item, it is most likely to be a lower temperature, frozen item, and the virus has a longer survival time. If its human, its most likely to fall into two categories: one is the people working in the market, who have been to the epidemic area at the end of May and the beginning of June, who have atypical or asymptomatic symptoms after infecting the new coronavirus, who return to work after returning to work and return to the market, causing market pollution, causing the spread between people; the other is the people from the epidemic area with imported cases who are likely to shop in the new place Infected environment, causing staff infection.

He said that the new coronavirus would lurk in some dark, humid, polluted and bad environment, and then suddenly expose to many people in a certain period of time. This time in Beijing, its very likely that patients who didnt appear at the end of may or the beginning of June will have to be pushed one month in advance. There are many asymptomatic infections or light patients in this case, so that there can be so many viruses in the environment.

Does this mean that the new coronavirus has been circulating in the population since April by a latent transmission chain? How to find the asymptomatic infection? Since then, CDC has no further elaboration and response.

In an interview with CCTV, Wu Zunyou revealed that the subjects to be investigated in the next step will be locked in the time of the earliest case in the Beijing epidemic and push forward another incubation period. During that period, the main changes in the market will be whether there are people from the areas where the cases are imported to return to the market for work or shopping.

Where does the virus come from?

The time for the virus to enter the market is uncertain, but there is almost a consensus that the virus comes from external input, which is also supported by the genome sequence data of the virus.

Chinas novel coronavirus National Science and technology resources service system released the relevant genome sequence data of the virus in June 18th. Two of the three data are genome sequence data of confirmed cases in Beijing, and one is genome sequence data of environmental samples.

Genome sequence data is the identity code of virus. The whole genome of new coronavirus was sequenced, and then bioinformatics analysis method was used to compare with the existing genome sequence of new coronavirus.

According to Jin Dongyan, a virologist at the University of Hong Kong, after checking and comparing the gene data of the three viruses mentioned above, there are only one or two differences between the three genes, indicating that they should come from the same source.

Yang Peng of Beijing CDC said in an interview with the media that the whole genome sequencing showed that the virus came from the European direction and was initially determined to be related to the import.

That is to say, the test results of our laboratory show that the virus is originated from Europe, may come from European countries, or may come from American countries, which may not be ruled out. Further information needs to be collected to help judgment. He said.

(function(){( window.slotbydup=window .slotbydup||[]).push({id:u6056789,container:ssp_ 6056789, async:true }An unexpected result is that the investigation of the epidemic situation in Beijings new market has brought new clues to the mystery of the spread of the new coronavirus. In the past, we have been looking for intermediate hosts in virus tracing. Now maybe its time to reexamine whether the virus comes from wild animals or not. Wu Guizhen told the website of China Commission for Discipline Inspection in an interview. This outbreak rebounded in Beijing and also concentrated in the wholesale market, but unlike the South China seafood market in Wuhan, the possibility of wild animals causing the outbreak in Beijing is very small. This gives us a very important hint: is it possible that the source is an infected person or contaminated food, and the environment of the seafood market creates opportunities for rapid spread. She said. Extended reading PepsiCo: how long will it last for all the factories involved in the product to isolate Beijing after sealing up the new epidemic? Is the community sealed or not? Is it safe for so many people in Beijing to do nucleic acid test together? Experts respond in this way: author of Beijing News: Xu Wen editor in charge: Shi Jianlei_ NBJ11331

An unexpected result is that the investigation of the epidemic situation in Beijings new market has brought new clues to the mystery of the spread of the new coronavirus.

In the past, we have been looking for intermediate hosts in virus tracing. Now maybe its time to reexamine whether the virus comes from wild animals or not. Wu Guizhen told the website of China Commission for Discipline Inspection in an interview.

This outbreak rebounded in Beijing and also concentrated in the wholesale market, but unlike the South China seafood market in Wuhan, the possibility of wild animals causing the outbreak in Beijing is very small. This gives us a very important hint: is it possible that the source is an infected person or contaminated food, and the environment of the seafood market creates opportunities for rapid spread. She said.