Analysis of epidemiological characteristics of the first SARS-CoV-2 Omicron BA.2 epidemic in Inner Mongolia Autonomous Region
Objective To analyze the epidemiological characteristics and spreading process of the first Omicron BA.2 COVID-19 epidemic in Inner Mongolia,provide a reference for the prevention and control of acute infectious dis-eases in the future.Methods The infected persons during in this epidemic were taken as the research objects,epi-demiological investigation,sample collection and laboratory testing were carried out for each infected person.The clinical symptoms,date of onset,epidemiological history and epidemiological association between infected persons had been investigated.Results This Omicron BA.2 COVID-19 epidemic occurred in Manzhouli of Inner Mongolia.Epi-demiological investigation showed that the indicate case onset date was April 22,and detected on April 23,with only 1 day interval between onset and detection.After the rapid adoption of positive measures on the day of the first case discovery,82.61％of the cases were found by screening at the isolation point,7 days for social clearance time,9 days for the epidemic lasted,no spillover to other cities and no large-scale social transmission.In 46 cases,gender ratio was 1∶1.3,the median age was 17 years old,which was mainly concentrated in ≤18 years old persons(50.00％)and 19～59 years old(36.96％).The occupation were mainly students(47.83％)and housework and unemployment(26.09％).54.34％of cases had obvious first symptoms,but 80.00％of cases mainly had pharyngeal discomfort symptoms such as pharyngeal dryness,pharyngeal itching,pharyngeal pain,only 16.00％and 4.00％of cases had fever and fatigue.The incidance rate of the class where the first case occurred in school was 18.97％,which was 38.71 times among teachers and students to other classes of this school(P＜0.05).Conclusion It showed that the"four early"measures played an important role in the control of blocking the spread of COVID-19 epidemic,which pro-vided good experience for the prevention and control of acute infectious diseases in the future.
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