On June 19th, Wu Zunyou, the chief expert in epidemiology of the Chinese Center for Disease Control and Prevention, interviewed CCTV News and revealed the latest progress of the traceability of the COVID-19 virus in the new epidemic.
“This epidemic occurred in the new place is very strange. It is not from Beijing, it must be someone or something outside Beijing who brought the virus to the new place.” Wu Zunyou said, it is not clear that the virus was brought to the new place What is a person or thing. If it is an item, it is most likely to be a cold, frozen item with a longer virus survival time. If it is a person, it is most likely to be two types. The first type is a person who works in the market. He has been to the endemic area at the end of May and early June. Those who are infected with COVID-19 virus have atypical symptoms or asymptomatic infections. Working in the market can cause market pollution and cause human-to-human transmission. One type is people from endemic areas with imported cases who go shopping in new places, which may pollute the environment and cause the staff to spread the infection.
Wu Zunyou said that the latest survey data shows that people infected in the new market are relatively concentrated in the aquatic products counter of the beef and mutton hall. These tips have pointed out the direction for us to solve this mystery, but we can’t yet answer what caused it. In such a local area, the pollution is serious and the number of infected people is relatively large.
He revealed that the next step is to focus on pushing the incubation period of the earliest case forward. During that time, the main changes occurred in the market. Are there people from the imported cases who return to the market to work or go shopping in the market? See if they have contact with previous infected persons, and at the same time check them to see if they have ever been infected with the COVID-19 virus. Then there is the further analysis of the items in the new place. From the sampling results, there is ground pollution in the market, and the sales items include some frozen seafood products. It needs to be further sorted out. Are these items contaminated before entering the market? This can be answered. Whether it was humans or things that brought the virus to the new place.
Wu Zunyou admitted that it is very difficult to trace the source. To sort out the action trajectory of personnel requires certain new technologies, and such new technologies need to be sorted out in a large number of people. The new place is a large-scale first-class wholesale market. The staff is complicated and the flow of people is large. The workload of sorting out these data is very large. Complicated.