Secret! 24 hours to lock the new place, how does Beijing do it?
On June 11, a patient with new coronary pneumonia was diagnosed in Xicheng District, Beijing. On June 12, the city conducted investigations on the farmer’s wholesale market and large supermarkets, and 40 new samples of environmental tests were found in the new market, and 45 people tested positive for nucleic acids. In the early morning of June 13, the Xinfadi market was temporarily closed, and 11 communities around the market were closed for management...
From finding the first confirmed case to targeting the “source” of infection—the new market, Beijing took only 24 hours. Within the next 24 hours, Beijing quickly delineated the key areas and populations of the new round of the epidemic, and quickly began to implement the most stringent regulations and comprehensive traceability.
Behind these precious 48 hours, the epidemiological investigators of the disease control system scrambled to find out every second, accurately and meticulously verify the trajectory of the case, and outlined the chain of epidemic spreading like silkworms, so as to gain time for Beijing's rapid response.
Uncle Tang: I'm 100% cooperative
"The Xicheng District CDC reported a positive case of nucleic acid test." At 0:30 on June 11, at the Beijing Centers for Disease Control and Endemic Disease Control, the on-duty doctor Dou Xiangfeng received a message from the director. The atmosphere in the office suddenly became tense. For Dou Xiangfeng, the word "positive" is a bit dazzling. "At that time, Beijing has not seen any newly diagnosed cases for 56 consecutive days, and we must defend the results of everyone's common adherence..."
Dou Xiangfeng didn't dare to neglect it for a moment, and hurriedly called the colleagues in the Xicheng District CDC to further verify the relevant situation of the case. At 2 a.m., the Xicheng District Disease Control Center sent a sample of the case for re-examination. "At 6 a.m., the re-examination test was positive again and the case was confirmed." Although more than half a month had passed, Dou Xiangfeng still recalled accurately. Each time point corresponds to one.
"The next step is to find the source of the virus." Just after 7 o'clock that morning, Dou Xiangfeng and his colleague Qiao Fuyu from the Xicheng Center for Disease Control rushed to Xuanwu Hospital and put on protective clothing expertly and entered the isolation ward. They have to supplement the diagnosis of the diagnosed cases, comb the cases for nearly 14 days, find out the source of the infection, and track the close contacts. "In a sultry hut, the'three uncles' started to talk about their knees." Dou Xiangfeng quipped Say.
"Doctor, I haven't been to other places this year, nor have I ever been in contact with any immigrant. Beijing hasn't seen a case in such a long time. How can I catch up with it." In the ward, Uncle Tang sat down on the bed in desperation, tight Lock's brows are full of anxiety. "The children at home are only in elementary school. I'm particularly afraid of spreading to him."
"My colleague has arranged for your family to go to the isolation point for 14 days of medical observation. Don't worry." Dou Xiangfeng comforted. "We are here to help you solve the problem. With your cooperation, we can definitely quickly figure out how you are. If you have a disease, you can screen for people who may be infected and reduce the risk of more people being infected."
"Cooperate! I cooperate 100%!" Uncle Tang said.
To facilitate recall, Uncle Tang took out his mobile phone and looked over the call records, WeChat chat records, payment records, etc. since May 30 over and over again. Based on this information, Dou Xiangfeng sorted out a few "suspicious points": he went to a supermarket, convenient food station, gas station near his home, and took his children to Jinghui Plaza and Letu Space in Fengtai District, of course. Including the Xinfadi agricultural wholesale market.
Only these "points" are not enough. Dou Xiangfeng also needs to guide Uncle Tang to perform "memory playback" to restore the details of each trip every day as completely as possible. "We first put together the recorded time points of Uncle Tang, and then narrate it to him in reverse. During the listening process, the relevant memories will be'played back' in his mind, which can help him think of more details and add Into the existing memory frame." Dou Xiangfeng said, for example, when investigating this trip in the Letu space, you need uncle Tang to recall in detail: what points and which two staff members exchanged tickets, which desk Go to the ticket check and see if you have contacted other people in the storage room; after sending the child into the trampoline area, he and his friends went to the underground billiard hall to play, and in the billiard hall, who did they contact...
Slowly, Uncle Tang opened the conversation box, and the "mysteries" were solved. "The process of melody is itself an interactive process. Recalling each specific itinerary with the case and missing a link may lead to The spread of the epidemic." Dou Xiangfeng said, in order not to let go of any possibility, they even asked Uncle Tang to recall the specific itinerary of the last wave of the epidemic.
Payment record locks the market stall in the new market
The information exchanged between Dou Xiangfeng and Uncle Tang has been shared with the disease control department. "For every'suspicious point' mentioned by Uncle Tang, we quickly arranged colleagues in the disease control area of the relevant area to conduct environmental sampling and tracing and source investigation, and investigate the close contacts." Dou Xiangfeng said, at the new place The agricultural products wholesale market has been listed by them as the "primary suspect". On the morning of June 11, the Fengtai District Disease Control Center was arranged to collect environmental samples, respiratory specimens and blood specimens of relevant personnel for testing to find suspicious sources of infection.
There are hundreds of stalls in the huge Xinfadi wholesale market. How to find the stalls and personnel that Uncle Tang has contacted with? Dou Xiangfeng said that the payment records in the mobile phone made a big contribution, "The payment records can clearly show which merchants spent on June 3 at Uncle Tang, although the merchant names displayed in the payment information are all nicknames, we hold Go to the site to ask about this nickname, basically you can locate a specific booth, which saves a lot of time for the on-site flow control work."
Dou Xiangfeng said that thanks to Uncle Tang’s accurate description of the fact that he went to Xinfadi to buy seafood and meat on June 3 and stayed for a short time, “8:27 am, 8:33 am, 8:37 am , I went to three stalls to buy seafood, and then went to the stall across the road to buy meat, there is a payment record as evidence, we feel very clear about the entire trip." Dou Xiangfeng said, after more than two hours of exchange, Tang The uncle calmly and clearly recalled everyone he contacted two weeks before the onset of illness, and provided a detailed list of 38 people.
After that, the disease control department provided the supplementary flow control results to relevant departments for big data investigation. The results showed that each flow control data perfectly matched the big data investigation data.
Environmental samples positive "lock" the new place
What exactly makes everyone finally lock the source of infection to a new place? "Among them, there may be a bit of luck." Dou Xiangfeng said with a smile.
On the evening of June 11, a third-party testing agency reported a positive nucleic acid test in a case in Fengtai District. This is the second case diagnosed in Beijing. "At 19:30, the testing agency sent a review sample, and at 23:30, the review detected a positive result. Half an hour later, in the early morning of June 12, the Fengtai District CDC conducted a check on the environment of the Xinfadi beef and mutton trading hall. The sample was tested positive." Dou Xiangfeng said, "At this time, the source of infection clearly pointed to the new agricultural products wholesale market-from the early morning of the 11th to the early morning of the 12th, we only spent 24 hours."
Dou Xiangfeng and colleagues immediately sorted out the rheology of these two cases and systematically sorted out the relevant data. In the early morning of June 12, he and Zhai Shuguang, the leader of the on-site inspection team of the center, immediately led the team to the Xinfadi agricultural products wholesale market for local flow and sampling.
Entering the beef and mutton trading floor on the ground floor, experienced Dou Xiangfeng and others immediately noticed the "abnormality" in the lobby. "The ventilation inside is very poor, and the cold and humid environment is conducive to the survival of the virus." Dou Xiangfeng said. In the morning, the first floor of the Xinfadi wholesale market was closed, and the vents and air conditioners were also closed. Dou Xiangfeng and colleagues wore protective clothing and endured high temperatures. They took another environmental sampling of the first floor and collected pharyngeal swabs from practitioners . At the same time, the city's CDC collaborates with 9 district CDCs to sample the market in different areas. On that day, 40 environmental test positive samples were found, and 45 swab swabs were positive.
Based on the sampling results of disease control personnel flow, Beijing moved quickly. Within the next 24 hours, we will resolutely close the Xinfadi agricultural products wholesale market, implement closed management of 11 communities around the market, and investigate those who have been to the Xinfadi agricultural products wholesale market since May 30 or have close contact with market sales personnel. Personnel, carry out nucleic acid testing, and carry out screening in the community...
After 20 days of continuous hard work, the prevention and control of the epidemic situation in the capital has stabilized and continued to strengthen. The number of confirmed cases reported daily has dropped to single digits for 4 consecutive days.
Dou Xiangfeng and his colleagues are still holding on, circling around the scene day and night to track the epidemic. If the epidemic does not retreat, they will not rest, "We are always there to guard the health of the people!"
Reporter Li Qiyao