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| Epidemiological analysis of epidemic outbreak of epidemic encephalitis B of Dawa District in Panjin City in 2018 |
| YU Zhen-rong |
| Department of Infectious Diseases,Center for Disease Control and Prevention of Dawa District in Panjin City,Liaoning Province,Panjin 124030,China |
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Abstract Objective To analyze the epidemiological characteristics of epidemic outbreak of epidemic encephalitis B of Dawa District in Panjin City in 2018,so as to provide basis for formulating prevention and control strategies.Methods The epidemic surveillance information,epidemiological investigation data and follow-up data of the epidemic of epidemic encephalitis B in 2018 and the historical data of epidemic encephalitis B in Dawa District from 1971 to 2017 were collected.Mosquito density and species were monitored by trap lamp method in residential corridors,rural cottage courtyards and livestock shed.Results From September 10 to October 10,2018,there was an outbreak of epidemic encephalitis B in Dawa District of Panjin City,16 confirmed cases with a morbidity of 3.60/100 000 and a fatality rate of 25.00%.There were 8 males and 8 females,12(75.00%)were over 40 years old,and 8(50.00%)were peasants.Six towns were affected by the epidemic,of which Tianjia Street had a maximum of 6 cases (37.50%).The onset time was concentrated from late August to mid-September 2018,with 3 cases (18.75%) in August and 13 cases (81.25%) in September.The median visiting and diagnostic time were 0.5 and 8 days after onset,respectively.One case collected cerebrospinal fluid and 15 cases collected serum for detection of epidemic encephalitis B IgM antibody,the positive rate was 100.00%.Nine cases (56.25%) had no history of epidemic encephalitis B vaccination,and seven cases (43.75%) had unknown vaccination history.The lowest density of mosquitoes was the 0.5/(lamp·h),the highest was 22.5/(lamp·h),and the median was 3.8 /(lamp·h).There were 7 epidemic spots in urban area,and 18 epidemic spots in rural area.Among them,17 (94.44%) were detected with Culex tritaeniorhynchus,and 912 mosquitoes were trapped,of which 247 (27.08%)were Culex tritaeniorhynchus.Conclusion There has been no epidemic of epidemic encephalitis B in Dawa District for 17 consecutive years.This outbreak is characterized by an increase in adult patients.It is the key to prevent and control the epidemic of epidemic encephalitis B by vaccinating adults,detecting and replanting children of appropriate age,preventing mosquitoes and killing mosquitoes,monitoring the epidemic situation of animals,and strengthening the ability of early diagnosis and treatment of medical institutions.
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