China-Singapore Jingwei client, June 15th, on the evening of the 15th, Wu Zunyou, the chief expert of epidemiology at the Chinese Center for Disease Control and Prevention, was interviewed by CCTV News 1+1 to see where the virus came from and whether all Beijingers should Wu Zunyou analyzed the nucleic acid detection and other related issues one by one.

1. Why both Beijing and Wuhan epidemics point to the farmers' market?

　　Wu Zunyou pointed out that we also compared the epidemic situation in Beijing's new place (appeared) with the epidemic situation that occurred in the southern China seafood market in Wuhan. The situation in Beijing is very similar to the situation in Wuhan in the early days. Are there any common rules here? We are thinking, analyzing, and exploring. One of the characteristics of these markets is that damp places and cold places may be suitable for virus survival. But it is very clear at present that (the virus) did not originate in Beijing, but was brought to Beijing from other places. This is very clear.

2. Where does the virus come from?

　　At the source of the outbreak in the new market in Beijing, there are two possibilities, one may enter Beijing through contaminated items, and the other may be spread by infected people, especially without symptoms or with mild symptoms. But I didn't realize it. Now more data is being collected to determine whether it is an item or a person.

　　Wu Zunyou also said that Beijing had discovered the epidemic suddenly in the absence of cases in the past two months. The most likely cause was that the virus was brought to Beijing from outside the region and outside Beijing. He said that the researchers isolated the virus in the patient's body and sampled the virus on the surface of the Xinfadi market object. The virus contaminated from the surface of the Xinfadi and the patient's body were completely consistent. After comparing with the strains that are popular in China and those around the world, it is found that it is most likely to be the main strain that is popular in Europe, but the main strain that is popular in Europe does not necessarily mean that it is from a European country. It is also mainly based on European strains, so it is not certain which country it comes from.

　　3. At what stage is the epidemic situation in Beijing?

　　Wu Zunyou pointed out that the epidemic situation in Beijing should be detected in a timely manner. From several perspectives: first, all cases are directed to the new market, and pointing to a source indicates that it has not caused widespread spread. Second, judging from the characteristics of the cases, family clusters and hospital clusters have appeared in Wuhan and other parts of the country. The characteristics of cases in Beijing did not observe family aggregation, nor did they observe patients going to the hospital for treatment, cross-transmission between patients occurred, triggering hospital aggregation.

　　Wu Zunyou said that all these data suggest that Beijing caught the epidemic as early as the epidemic and accurately locked it in the new market. It was discovered the first time the outbreak occurred, and it prevented further spread of the outbreak.

4. Do all Beijingers need to do nucleic acid testing?

　　Wu Zunyou believes that nucleic acid testing is a very effective means to detect infected people and patients in a timely manner. How to carry out nucleic acid testing scientifically and obtain the benefits of prevention and control under the maximum economic benefit. There is no need to conduct a large-scale screening of the people of the city in Beijing. For the response to this epidemic, we should do the necessary inspections, mainly infected people, close contacts of patients, or people who have been to the new market, and patients who have visited the hospital, and account for these people Detection can detect infections in a timely and effective manner.

5. When was the earliest infection and exposure in this outbreak?

　　Wu Zunyou said that the earliest time to discover cases and infections in Beijing should be around the end of May. The earliest diagnosis time is 11 days, and the onset time is reported to June 5. We believe that infection and exposure should occur at the end of May and early June.

6. Is it necessary to separate all persons from Beijing to other areas?

　　Wu Zunyou said that after the outbreak in Beijing, various places had different reactions. In fact, the epidemic in Beijing is still very limited. It is limited to individual communities and has not spread to the entire city of Beijing. We advocate scientific prevention and precise prevention and control, that is, to accurately define the epidemic area, there is no need to adjust the risk of the entire Beijing to medium risk. Travel to Beijing and tourism should not be subject to any restrictions. Returning from Beijing to various places, as long as you do not go to medium and high risk areas, there is no need to implement isolation.

7. How to treat the spreading chain and everyone's concerns about salmon and even seafood?

　　Wu Zunyou believes that the salmon caused some misunderstanding and misunderstanding in the report. A positive sample found on a salmon sample, or a positive nucleic acid sample on a salmon board, only indicates contamination. This kind of pollution may be caused by the market in Xinfa, and it does not completely mean that the fish imported from abroad or the fish itself was contaminated from the beginning. For the environment, except for salmon, other items have been found positive, especially on other surface objects in the same hall. This just shows that it has been contaminated here, and it can not explain more problems.

8. Can fish or even chicken be bought and eaten with confidence?

　　Wu Zunyou replied that first of all, there is no data to confirm that seafood and meat products are the source of support for the Beijing epidemic. Second, as long as there is no epidemic in the place of production, the products in these places are safe. For example, seafood and pork and poultry produced in Guangzhou and Qingdao are farmed in the surrounding areas, and there is no problem.

　　Wu Zunyou reminded that if the place of origin belongs to a country or region where the epidemic is serious, if pollution is caused in the production link and transported through the cold chain, pollution is possible. For this kind of pollution, it is necessary to strengthen quarantine, especially the entry quarantine, to reduce the risk. For ordinary people, most of the products currently on the market come from non-epidemic areas, so there is no need to worry too much. Special attention should be paid to products from overseas. On the one hand, pay attention to the place of origin, and pay attention to hygiene when handling food. In particular, raw food and cooked food should not be mixed together. Try not to eat raw food.

9. Is Beijing going to recover from level 3 response to level 2, or even level 1 response?

　　Wu Zunyou pointed out that the current epidemic in Beijing is still a local incident, and its scope is still very limited. For the entire Beijing, there is no need to adjust the response level. At present, it should be said that the measures against the epidemic at the origin of the new development are still very powerful. We are confident that the epidemic will not cause a wider spread. Therefore, there is no need to adjust the response level of the whole Beijing for the time being, it is possible to adjust for individual districts.

10. How long will the future be the key time for Beijing to face the epidemic?

　　Wu Zunyou said that the next three days will be the critical time for Beijing to face the epidemic this time. The number of cases reported by Beijing in these three days determines the direction of the epidemic. Beijing experienced an outbreak on June 11, and responded quickly on the 12th and 13th, controlling the development of the outbreak in a timely manner. For patients who have already been infected, if the onset occurs tomorrow, and the number of reports does not increase, it can be said that it has basically stabilized at this scale. (Sino-Singapore Jingwei APP)

(Text Comprehensive CCTV News Client, Global Network, Beijing Daily Client)