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Original title: Exclusive | Dialogue with experts in disease control, revealing the entire flow of confirmed cases that exposed aviation container
“As of now, this (aircraft) exhibition is only one case in the world, and it has also raised the alarm for the world. Material defense is not limited to cold storage.”
Speaking about previous work to trace the source of the new corona pneumonia, Pan Hao, deputy director of the Shanghai Centers for Disease Control and Prevention’s new corona prevention and control field working group, said .
On November 23, the 88th news conference on prevention and control of the novel coronary pneumonia epidemic held in Shanghai reported that Wang Moumou, a confirmed case of new coronary pneumonia in Shanghai on November 9, and the Provincial Department of Anhui Disease Control and Prevention In the case of Lan, who was associated with XX and was diagnosed in Anhui on November 10, the two cases entered and cleaned an aviation container after being transported back to Shanghai from North America. October 30.
Previously, Yingqian Village, Zhuqiao City, Pudong New Area, where Wang lived, was listed as a medium risk area.
How to trace the origin of these 2 cases? How did you discover that they were jointly exposed to the aircraft? On November 27, a reporter for The Paper (www.thepaper.cn) had an exclusive conversation with Pan Hao, revealing the entire circulation process.
November 9 Night Sampling This article is provided by Shanghai CDCPerson to person? Flow regulation detection is the first time to exclude
In the early morning of November 9, Pan Hao received a call from an expert from the Pudong New Area Center for Disease Control and Prevention. The other party said a confirmed case of new corona had been found, but the source of the infection was unknown.
“The emergence of this case coincides with the high incidence of infectious respiratory diseases. The current international epidemic situation is quite dire. Once confirmed as a confirmed local case, it will bring serious challenges to Shanghai’s epidemic prevention and control work.”
That night, Pan Hao ran to the Pudong New Area CDC. At that point, the first question that needed to be confirmed was where was the source of infection coming from in this case? Therefore, the flow adjustment work has become the most critical part.
To this end, Pan Hao, his colleague Kong Dechuan, and Liu Bo, a staff member at the Center for Disease Control and Prevention in Pudong New Area, were ordered to establish a flow traceability research team. According to the requirements, they must “solve the case” within 48 hours, which means that they are not only competing against the virus, but also getting ahead of the virus to prevent the virus from spreading locally.
Whether there is a possibility of person-to-person transmission is the main issue to be confirmed in the circulation work.
Pan Hao noted that Wang Moumou arrived in Shanghai from Anhui on April 8 this year and was carrying out transportation work at the Western Airline’s cargo terminal at Pudong Airport.
“At first, we considered whether there is a possibility of transmission of asymptomatic infections. Therefore, we conducted a screening of the relevant personnel in Yingqian Village, Zhuqiao City, Pudong New Area and their workplaces, but it is not known. they found confirmed cases, “said Pan Hao. .
According to official data, on November 9, Shanghai verified and managed 28 close contacts, 190 close contacts, 51 general contacts and 9,617 people involved in case screening. The new coronavirus nucleic acid tests of the mentioned people were all negative. A total of 1,428 environmental samples were collected from workplaces and residences, and the results of nucleic acid tests for the new coronavirus were all negative.
Subsequently, the investigative work began to investigate the origin of the contagion from his family, colleagues, public transport he took and places he had visited.
“According to current surveys, she has a son who is a chef and has worked in four restaurants. At that time we considered whether to have exposure to frozen foods, but in the end it was confirmed that there was none. This track was broken again,” said Pan Hao . They examined relevant personnel in all public places this case was attended, including Jiangzhen Wanxia Road Vegetable Market, Jiangzhen Baipinhui, Miaojing Road Social Security Center, etc., which they attended. These projections were made at 24 hours. It was completed in a few hours, but in the end there were still no clues to the source of the infection.
The flow survey showed that this case had not been in contact with confirmed cases of new coronary pneumonia, suspected cases, confirmed cases discharged, asymptomatic infections and cases of fever in the 14 days prior to the onset of the disease, and there were no contacted entry staff, crew members, and staff in high-risk school areas. Eliminate the possibility of “person-to-person transmission”.
Common Exposure? Blocking the workplace
Only 24 hours left.
On November 10, a sudden news item inspired the circulation work: According to comments from the Anhui Provincial Disease Control Department, Lan, who was associated with Wang, was diagnosed in Anhui on November 10.
“After hearing this news, we closed the workplace on this case and carried out a fine retrospective flow of 28 days before the onset of the illness, including your morning, afternoon and evening work arrangements and details every action and every place. ” Pan Hao revealed that at that time a detailed circulation of workers and more than 20 close contacts of the case was conducted, after more than half a day, there was a ray of light.
“At the time, a worker told us that they had handled a batch of boxes, and one box was full of things.” Pan Hao said that under the joint defense mechanism and joint control, customs and the airport group confirmed that the box was made known later. The aviation container, and there was foam in this container at the time and a lot of people cleaned it up, these two confirmed cases were involved in this work at that time. When cleaning, neither of them wore masks.
Check the warehouse surveillance video.On November 11, 5 transfer personnel went to the cargo logistics area of the airport to learn about the case work 14 days before the onset of the disease through video surveillance, the entire process lasted 5 hours.
Surveillance video shows: On October 30, the two confirmed cases did not wear masks and entered the same aviation container to process the foam, which took more than ten minutes. Among them, Wang Moumou, who had an earlier start, took longer to clean up.
Material inheritance? Gene sequencing to discover
Pan Hao believes that there will be no disease without exposure, but even if the two cases are exposed together, it does not mean that the source of infection is the aviation container.
At that time, they approached the airport authority and learned that each aeronautical ULD had a specific digital code, and they were able to find out where it had been.
Shanghai Municipal Disease Control and Prevention conducted aviation container sampling.This aviation container was verified to have been shipped to North America on August 27 of this year, and was not filled with frozen food at the time. It was shipped back to Shanghai by a local logistics company on October 21 and foam cleaned on October 30. Later, I want to send it again.
During the period from May 24 to October 30 of this year, the North American logistics company that had transported this air container had more than 10 confirmed cases, and these cases may have come into contact with this air container.
Taking into account that the foam may carry the virus, Shanghai will contact the personnel related to this aviation container 8. After 14 days of medical observation and 2 nucleic acid tests, the final result will be negative.
At the same time, gene sequencing from the Shanghai Centers for Disease Control and Prevention finally found that the genes from these two cases were highly homologous and very similar to North American strains, suggesting that the source of infection was imported from abroad. At 4 p.m. on November 11, the case was finally resolved.
“As of now, this type of exhibition has been the only case in the world, and it has also sounded a wake-up call for everyone. Material defense is not limited to cold storage.” Pan Hao further said that current studies also show that the virus survives in low temperatures. The time will be longer and the exterior can survive more than 15 days and in extreme cases it can be even longer.
As of the time the case was resolved on November 11, the screening range for these two confirmed cases involved a total of about 10,000 people, and it was precisely the precise, detailed, fast and detailed epidemiological investigations that did. of this “unclear case” with an unknown source of infection. The final result.
