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According to China News Network 1 case, 137 cases and 26 cases. A total of 164 people have been infected with the new coronavirus in Kashgar, Xinjiang, for 3 consecutive days, and all are asymptomatic.
Following the report of a case of asymptomatic new coronary pneumonia infection in Shufu County, Kashgar Prefecture, Xinjiang on the 24th, local close contacts and close contacts of close contacts were analyzed for nucleic acid, and the next day 137 asymptomatic infections were found. Through the free nucleic acid test for all employees that was carried out immediately in Kashgar, the official report indicated that as of 4:00 p.m. on the 26th, there were no confirmed cases of new coronary pneumonia in Xinjiang and 26 new cases of asymptomatic infection, all in Shufu County.
Wang Guangfa, Director of the Department of Respiratory and Intensive Care Medicine at Peking University First Hospital, noted when discussing the epidemic:People infected with the new coronavirus usually have a positive nucleic acid 2 days before the onset of symptoms. The situation of this case in Kashgar, Xinjiang, may be due to the fact that most of these patients are in the early stages of the disease, and the other is because the local response is relatively rapid, which can appear in patients . Symptoms have been traced before.
“If infected people in Kashgar are detected earlier, they may be asymptomatic, but that does not mean that these infected people will not develop symptoms and become confirmed cases in the future,” said Chen Xi, associate professor at the School of Public Health of Yale University. On the other hand, consider When the infection occurs in the factory and the workers are mostly young, the probability of asymptomatic patients will be higher, a situation that has manifested itself in clinics in many parts of the world.
People who are asymptomatically infected with the new coronavirus are often referred to as “silent communicators” and are now a matter of international concern.
Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, recently noted that the estimated proportion of asymptomatic infections in the United States is 40% to 45%.
A large-scale population study in 19 countries and regions previously published by the international medical journal “Public Science Library Medicine” showed that asymptomatic infections accounted for about 20% of people infected with the new coronavirus.
Asymptomatic infections have caused statistical problems in all countries due to their own “concealment”. Many countries have adjusted their statistical and detection methods for asymptomatic infections several times.
The first case of asymptomatic infection in Kashgar, Xinjiang, was discovered by local authorities during regular nucleic acid testing by “should check and do everything” staff in Shufu County, Kashgar. A further CT examination of this case by the hospital showed no abnormalities and the IgM and IgG antibody tests were all negative.
At present, although there have been no reports of asymptomatic infections turned into confirmed cases in this epidemic, the origin of the epidemic is still unclear and the chain of transmission remains complicated.
To clarify the path of infection, Chen Xi said antibody tests should be specifically increased. “For small areas where a certain amount of infection is suspected, such as Kashgar, where community transmission is not known when it will begin, it is appropriate to add a representative antibody test.”
“Based on past experience, if there is no source of asymptomatic cases, you have to be very careful.” Wang Guangfa said that the range of human activities is limited and a new coronary patient can infect an average of 3 people. According to these data, the number of asymptomatic infections this time can mean that there have been second, third or even more infectious cases, and the appearance of “super contagious” cannot be ruled out.
“We can only call the first case discovered this time the indicated case, and it may not be the first infected case.” According to Zeng Guang, former chief epidemiology scientist at the Chinese Center for Disease Control and Prevention, the case in Xinjiang this time is The possibility of it occurring in Shufu County is unlikely and the infection may have been caused by some contact with the outside world.
Zeng Guang emphasized that for the moment, the urgent task is to put all the asymptomatic infections that have been found at the same level for analysis, concentrate on doing an epidemiological investigation of all and clarify the relationship between the cases.
Kashgar in Xinjiang is located at the western tip of China and is also a major gateway for China to open to the west. As of 4:00 PM on the 26th, a total of 4,471,700 people had been sampled in Kashgar, and the results had been 2,133,600. The official stated that he would ensure that all Kashgar employees completed nucleic acid testing on the 27th.
“This epidemic is different from the past, because it occurred in rural areas and a minority nationality, but the detection of the epidemic is still relatively early.” In Zeng Guang’s view, the scale of the epidemic in Kashgar cannot be determined at the moment. The most important task is to expand nucleic acid testing and focus efforts on epidemiological investigations.
Besides the possibility that those infected are still in the early stages of infection, does the discovery of a large number of asymptomatic infections mean that the pathogenicity of the virus is weakening?
“Some of the new coronaviruses found in Asia have been different from the strains found in North and South America. From a virological point of view, the virus has always become increasingly adapted to the human body.” Chen Xi believes that the new coronavirus depends on the human body for a large number of transmissions and is toxic. There is the possibility of a gradual decline and increasingly difficult to discover.
In this regard, Zeng Guang analyzed that to determine whether the virus has changed, it is also necessary to perform a genetic analysis of the virus and respect the results of actual research and analysis. “Virulence and transmission of the virus have shown a diversified trend.” Zeng Guang said that people have only been dealing with the new coronavirus for ten months. The current view of the virus may be different from the initial view of the virus, but it still needs more research.
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Related reading:
There are 137 new cases of asymptomatic infections in Xinjiang, and more than 600 people conducting nucleic acid tests are urgently supporting Kashgar.
Close contacts of asymptomatic infections have been quarantined in Kashgar, Xinjiang, and nucleic acid testing will be conducted for all personnel.
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