According to the National Health Commission, at 0-24:00 on March 11, 31 provinces (autonomous regions and municipalities directly under the Central Government) and the Xinjiang Production and Construction Corps reported 476 new locally confirmed cases and 1,048 new asymptomatic infected people.
In this regard, on March 11, a total of 1524 new positive cases were confirmed in Japan alone (476 cases were confirmed in the mainland; 1048 cases of asymptomatic infection in the mainland), which is the most new day in a single day since 1886 new cases on February 17, 2020.
Health Times combed and found that the provinces with more than 200 new infections in a single day were 559 cases in Shandong (159 cases confirmed in china and 400 cases of local asymptomatic infection), 400 cases in Jilin (134 cases confirmed in the local area, 266 cases of local asymptomatic infected people), and 224 cases in Guangdong (33 cases confirmed in the local area, 191 cases of local asymptomatic infection). Among them, Shandong and Jilin have experienced campus cluster epidemics. In addition, the number of indigenous asymptomatic infected people has exceeded the number of confirmed cases for 6 consecutive days.
Epidemic in Shandong: Multi-point sporadic and clustered, there is a campus cluster epidemic
On March 1, the alarm of the current round of epidemic in Shandong sounded. On the same day, the Qingdao Municipal Health Commission issued a notice saying that in the huangdao district of Qingdao City, 1 case of positive new coronavirus infection was found in the routine nucleic acid testing of key populations. As of March 11, Shandong Province has had local confirmed cases of COVID-19 in 8 cities: Qingdao, Weihai, Zibo, Yantai, Dezhou, Rizhao, Binzhou and Weifang.
The epidemic in Laixi, Qingdao was discovered from Laixi Seven, and since then, the number of teachers and students infected in the school has continued to rise. From 00:00 on March 5, Laixi No. 7 Middle School (No. 25 Longkou East Road) was adjusted to a high-risk area.
The day after the outbreak of the epidemic in Laixi, Qingdao, at the press conference on the prevention and control of the epidemic in Qingdao held on the morning of March 5, Xing Xiaobo, deputy director of the Qingdao Municipal Health Commission, analyzed that combined with the characteristics of the Aomi Kerong variant, from the relationship between the confirmed cases in Laixi and the chain of transmission, the epidemic has been hidden in the school for a period of time. In addition, the school is a day school, and there is a greater risk of community transmission caused by the spread of infection to family members.
Jilin epidemic: the spread is rapid and hidden, the scope is widespread, and there is a cluster of epidemics on campus
In the current round of epidemics in Jilin Province, the number of confirmed cases in Jilin Agricultural Science and Technology College in Jilin City is relatively large, and there has been a school cluster epidemic.
For five consecutive days, Jilin Agricultural Science and Technology College reported the discovery of infected people.
Of the 47 infected people on March 7, five were asymptomatic students of Jilin Agricultural Science and Technology College. On March 8, the number of infected people in the school surged, and of the 138 infected people in Jilin City, 14 were confirmed and 43 were asymptomatic infected people in the university dormitory. On March 9, the number of infected people reported in Jilin City reached 283, one of whom was located in the dormitory of Jilin Agricultural Science and Technology College. On March 10, there were 93 new locally confirmed cases in Jilin City, and the notification showed that 4 of them were confirmed and 2 asymptomatic infected people lived in the dormitory of Jilin Agricultural Science and Technology College.
On March 11, the press conference on the prevention and control of the epidemic in Jilin Province was announced, and the preliminary judgment was that the local new crown pneumonia epidemic in Jilin Province was imported in late February and spread locally. Zhang Yan, deputy director of the Jilin Provincial Health Commission, introduced that the current round of epidemic has shown the characteristics of hidden and rapid transmission, affecting many regions and a wide range, and the clinical symptoms of infected people are not obvious. Since the outbreak of the epidemic coincided with the spring school season, the cross-regional flow of personnel increased, further accelerating the spread of the epidemic, and some schools had a cluster epidemic, and the situation of community prevention and control and campus prevention and control was severe and complex, and prevention and control was difficult.
In addition, in addition to Shandong and Jilin, there have been campus epidemics in Yunnan Academy of Arts and Shanghai University recently.
Disease control experts: The beginning of the school season strictly prevents the occurrence and spread of the epidemic on campus
On March 8, at the press conference on the prevention and control of the new crown pneumonia epidemic in Shaanxi Province, Zhang Yi, director of the Institute of Infectious Disease Prevention and Control of the Shaanxi Provincial Center for Disease Control and Prevention, introduced that the last round of the new crown pneumonia epidemic in Xi'an City caused as many as 7 clusters of epidemics of all types of schools at all levels, and the characteristics of the new crown pneumonia epidemic on campus were fast transmission speed, long duration, many cumulative cases, and difficult to control.
The recent cluster of epidemics on the campus of Aomi Kerong in other provinces has shown a faster transmission speed, such as the epidemic in Laixi, Shandong, which has accumulated more than 100 cases in just 5 days, and many schools in Jilin City, Jilin Province, have also had epidemics. Moreover, the BA2 subtype of the Omiljung strain was significantly more aggressive to small age groups.
Therefore, it is recommended that governments at all levels and education departments should attach great importance to the prevention and control of the epidemic on campuses, formulate various epidemic prevention measures and emergency response plans, and strictly prevent the introduction of viruses into schools.
Why are there more asymptomatic infected people in the recent outbreak?
"Asymptomatic infected patients refer to those who have a positive nucleic acid test for the new crown virus but have no relevant clinical manifestations, such as sore throat, fever, fatigue, dry cough, hypofactory and other signs and symptoms, and no CT imaging features." Jiang Fachun, deputy director of the Qingdao Municipal Center for Disease Control and Prevention, explained at the press conference on epidemic prevention and control in Qingdao on March 7.
Why are there more asymptomatic infected people in the recent outbreak? Jiang Fachun's analysis has the following three reasons:
First of all, it is related to the characteristics of the Omiljunn variant strain, with the mutation of the virus, the Omiljunn variant strain is more infective, and the clinical symptoms are relatively mild, which will cause many infected people to not show clinical symptoms after infection, which is an important feature.
Secondly, related to large-scale population immunization, now the coverage rate of vaccination is very high, after vaccination, the body's immunity is enhanced, even if infected, relatively speaking, some symptoms may not be expressed, which is also a very important reason, so vaccination is still very effective.
Finally, in Jiang Fachun's view, "the increase in asymptomatic infections is related to our early detection and control." Once it appears, the rapid screening and rapid detection of disease control personnel, the early implementation of these measures, so that some early infected people are quickly discovered, which is very important, before the symptoms have been detected by us, which is a very important feature." (Lu Yang, Li Xin)
