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to tighten up the express industry's epidemic prevention requirements. The focus of the new crown epidemic prevention should be "human transmission"

Wen Wen, "finance and economics" reporter Ling Xin Na Na

editor Wang Xiao

has been on the decline since the outbreak of COVID-19 in October 2021. The total number of new infections in the past two days has remained below 50

, however, worries about COVID-19's "material successor". A resident in Haidian District of Beijing bought goods from Inner Mongolia, and the outer packaging was tested positive < p > on November 15, Zhongguancun Street, Haidian District, Beijing reported that nucleic acid tests were carried out on close contacts and other environmental samples, and the results were negative. However, since this round of Dalian's local cold chain related industries has been the third time that there have been aggregated cases, most of the infected persons initially reported are staff working in a cold warehouse of imported cold chain food. As a result, concerns about COVID-19's "material distributor" have caused some "double eleven" online shopping packages to be affected. p> < p > on November 10, China CDC issued health protection guidelines for takeout delivery and express delivery practitioners < p > Zhang Liubo, chief expert of disinfection of China CDC, suggested at the press conference of the joint prevention and control mechanism of the State Council on November 13 that proper protection should be done when receiving express delivery, surface packaging should not be brought indoors or disinfected, and hand hygiene should be done after handling express delivery

, "no need to be overly nervous," many experts said in an interview with "finance and economics" reporter that although there are many cases of nucleic acid positive detection on express and food packages, once COVID-19 leaves the body, it will gradually die. Before that, there are few cases of live virus poisoning on the articles, and the dead virus is not infectious. p> < p > "an ordinary person is much less likely to be infected by the virus because he receives an express than to be killed by a car on the street," said Jin Dongyan, a virologist at the University of Hong Kong < p > Beijing, Inner Mongolia, Hebei and other places tracked down the express, and Lanzhou asked the express not to enter the community < / P > < p > Beijing found that the nucleic acid in the package of express goods was positive, which was detected after receiving the notice from Xilin Gol, Inner Mongolia. The outer package of the express has been discarded, but the Beijing Haidian District CDC found that the test result of its inner package non-woven bag was positive

the Inner Mongolia Autonomous Region in October 16th, and 1 confirmed cases were the starting point of the current outbreak. p> < p > a staff member of Xilin Gol League CDC confirmed to Caijing that all express deliveries in and out of the League will be disinfected and tested for viruses. If a virus is found on the express package, the recipient of this batch of packages will be notified < p > on November 15, the buildings of Beijing residents who were found to be positive express delivery were temporarily closed, and the four people involved were centrally isolated. The first test results were negative < p > according to the Beijing News, the items with positive nucleic acid detection are woolen sweaters purchased from Xilin Gol. Previously, Xilin Gol had informed that Xilinhaote residents purchase clothing, boots were detected COVID-19 nucleic acid positive. China News Network said that the two clothes were purchased from the same store. The store has purchased four batches of goods from Mongolia since October 6, and took the initiative to report to the local disease control department and accept testing on November 7 < p > Erenhot, another city under Xilin Gol League, also reported on November 4 that after testing the commodities purchased by Mongolia received by five local citizens, some results were found to be positive. It is required that the mail order commodities received from countries with high risk of overseas epidemic since September 15 should be "not opened or touched" and reported immediately < p > in addition to Xilin Gol, in this round of local epidemic, a batch of emails sent from Shijiazhuang, Hebei Province were also required to be closely investigated because three workers of a trading company in Jinzhou were tested positive for nucleic acid. In Yulin, Shaanxi Province alone, 130 packages need to be checked < p > as of press time, in addition to Beijing, Fuxin, Liaoning also reported the detection of nucleic acid positive after express delivery. In Heihe City, Heilongjiang Province, the outer packaging test results of stored food from Russia were positive < p > at the peak of online shopping and distribution after the "double 11", Chongqing, Yangzhou and other places issued emergency notices to tighten the epidemic prevention requirements of the express industry. Lanzhou requires mail from overseas and domestic medium and high-risk areas to be stored in different areas, strictly disinfected, and express "shall not enter the community", but receive it without contact after killing

the possibility of "material transmission" is less than 1/10000

will express delivery COVID-19? On this issue, Caijing reporter interviewed a number of Virology and Xinguan epidemic prevention and treatment experts

China Center for Disease Control and prevention, explained at a news conference that the conditions for express delivery of COVID-19 need to meet three conditions simultaneously. First, COVID-19 was polluted during the process of receiving and sending express. Second, when receiving courier, COVID-19 will still survive on the Express items. Third, when receiving couriers, it was contaminated by COVID-19. P>

even if COVID-19 is alive on the surface of the article, the virus must be high enough to be infected. "After touching the product and rubbing your nose, or not washing your hands, COVID-19 is exposed to the mucous membrane and breaks through all the links before it can cause infection." Wang Guangfa, director of the respiratory and critical care medicine division of No.1 Hospital of Peking University, said. In April p>

2021, an article from the CDC said that compared with direct contact and droplet transmission or air transmission, COVID-19 had a lower risk of "material transmission", "generally less than 1/10000". p> < p > an insider of China's disease control system has tested many express packages to determine whether there is a virus on them. He said that most of them are false positive, that is, there is no virus at all, but the specific situation needs to be further confirmed by sequencing

's rapid nucleic acid detection is to detect a fragment of COVID-19 nucleic acid in the sample. Once detected, it will show a positive result, and the possibility of false positive caused by similar fragments of other viruses cannot be ruled out. In addition, this method can not judge whether the virus is dead or alive < p > to infect people, the virus should not only be a gene fragment, but also have complete virus particles and activity. "If you only see the gene fragment of the virus, it is equivalent to seeing the corpse of the virus," Zhang Hongtao, associate professor of research in the Department of pathology and experimental medicine at the University of Pennsylvania School of medicine, explained in an interview with Caijing < p > in October 2020, the Chinese Center for Disease Control and PreventionIn the novel coronavirus pneumonia investigation, a live virus was isolated from the positive samples of imported frozen cod. In June 2021, the weekly report of China Center for Disease Control and Prevention (in English) published a research article by Gao Fu and others, which said that through genetic testing, it was found that five virus strains detected on the outer packaging shared a unique nucleotide mutation with those in the infected workers

the study also traced back the history of the contact between docks and international freighters, and concluded that there was no direct contact between the two and no evidence of the latter being infected by COVID-19. However, whether the contaminated goods were exposed to COVID-19 infected persons in the last round of transport links, the research team has not yet grasps them, so they can not clearly establish a complete communication chain. p> < p > in this regard, Jin Dongyan said, "no one denies the possibility of 'animal to human transmission', but it is very, very secondary in the sense of epidemiology. The detection of live virus in Qingdao is also the only report I have seen about live virus." < / P > < p > "don't worry about this problem." Zhang Hongtao believes that, Disease control personnel will continue to try to isolate, culture and detect live viruses on the surface samples of articles during epidemic prevention. Since no more cases have been reported, this situation is indeed rare

express transmission virus risk is lower than cold chain

Ordinary Express will experience many links in transportation. With this process, COVID-19 activity is decreasing. P>

, "the risk of express delivery is lower than that of cold chain." Jin Dongyan analyzed that COVID-19's transmission through human droplets will continue to decay after falling to the surface of the article, which can detect live viruses in the cold chain or slow down the death of the virus. p> < p > as for several cold chain staff aggregation cases in Dalian, Qingdao and other places, it is more likely that a staff member was infected when contacting items, and the infected person spread the virus to his colleagues, relatives and friends < p > "this is a typical 'person to person'." Jin Dongyan analyzed the reporter of Caijing and suspected that Xinguan's "thing to person" can only be a speculative conclusion. He further analyzed that the object detected a new crown positive, or it may be that someone contaminated the object

a team from Hongkong examined the survival of COVID-19 on different surfaces at room temperature. The results showed that the survival time on the outer layer of medical surgical mask was the longest, more than seven days, and on the surface of cardboard and copper was four hours. The findings were published in the lancet microbiology journal in 2020

and a team from Singapore and Ireland showed that COVID-19 could survive for at least 21 days in a cold chain. Compared with the two studies, the survival time of virus in normal temperature environment is shorter < p > according to an article by the CDC of the United States, the live virus cannot be detected on the porous surface contaminated at room temperature after a few minutes or hours. Even non porous surfaces such as stainless steel, plastic and glass will reduce the infectivity of viruses by 99% within 72 hours < p > prevent the spread of express delivery, wear masks and wash hands frequently < / P > < p > although the risk of infection in receiving conventional express delivery is very low, the national CDC has issued epidemic prevention guidelines for the express industry, which can further reduce the risk of "transmission from material to human" < p > according to the requirements of the guide, the employees of takeout and express delivery change masks and gloves every four to six hours, and advocate the disinfection of takeout distribution boxes, especially the closed boxes, brake handles, handrails and other frequently contacted parts of express delivery vehicles. In distribution, non-contact receiving and dispatching is advocated < p > a person in charge of SF express told Caijing that at present, express, equipment, vehicles and venues involved will be killed twice a day, and employees and visitors should register for temperature measurement and wear masks. Yunda staff said that they would adjust the ventilation and disinfection measures according to the local epidemic risk level < p > "the amount of virus on the surface of general items will not be very high. Even if people are infected, it will be very mild, which may be mild and asymptomatic," Jin Dongyan said. At the beginning of 2021, a batch of imported cherry nucleic acid was found to be positive, but no one was infected after eating this food, and no local epidemic was found in the provinces where the goods were spread < p > the key preventive measures are still wearing masks and hand disinfection, protection and disinfection. Zhang Liubo suggested that proper protection should be done when receiving express, wear masks and gloves, and keep personnel at a distance of one meter. "The surface packing requirements of express delivery are not brought into the room. When you are sure to bring in, you can wipe the disinfectant or disinfect the spray with disinfectant wipes on the six sides." p> < p > experts remind that the focus of epidemic prevention in Xinguan is still "human to human". If there is a "super communicator" with a high load of COVID-19, almost everyone can be infected with him in close space. Therefore, we should continue to popularize vaccination, adhere to wearing masks and disinfect hands