Epidemiological characteristics of a local dengue fever outbreak triggered by a construction site in Shenzhen
Objective To analyze the epidemiological characteristics of a local outbreak of dengue fever caused by a construction site in Shenzhen City,evaluate the effectiveness of control measures,and explore dengue fever prevention and control strategies suitable for local characteristics.Methods Epidemiological investigations were conducted on dengue fever cases during the outbreak.Descriptive analysis methods were used to analyze the epidemiological characteristics of the outbreak.The Breteau Index method and double-layer trap method were employed to monitor mosquito density and evaluate the effectiveness of control measures.Results A total of 85 cases were reported in this outbreak,all of which were local cases.Among them,76 cases(89.41%)were laboratory-confirmed,and 9 cases(10.59%)were clinically diagnosed.All laboratory-confirmed cases were identified as Dengue Virus Serotype 1(DENV-1).There were 64 male and 21 female cases,with no critical or fatal cases.The age of cases ranged from 4 to 78 years old,with the highest number of cases occurring in the 31-<50 age group(43 cases,50.59%).The majority of cases were construction workers(38 cases,44.71%).The outbreak was mainly concentrated in Qiutou Community,Fu Hai Street,Bao'an District,accounting for 69 cases(81.18%).The median and quartile M(P25,P75)interval between onset of illness and diagnosis was 3(2,5)days,with construction workers having a shorter interval between onset and seeking medical attention compared to other residents.After implementing control measures such as case search,isolation and treatment,mosquito control,cleaning of mosquito breeding sites,and health education,the daily average Breteau Index decreased from the initial 12 to below 3,and the adult mosquito density remained at 0 mosquitoes(person/hour).Conclusions This outbreak was a local dengue fever outbreak initiated at a construction site.After the community staff participated in the comprehensive prevention and control measures,including case searching,mosquito elimination,clearing of breeding grounds,environmental health inspection,and education and propaganda,the epidemic was effectively contained.In addition,the continuous improvement of clinicians'diagnostic levels for dengue fever and the popularization of dengue fever antigen primary screening reagents(NS1 antigen reagents)in medical institutions may have played a crucial role in the early detection of the epidemic.
Dengue feveroutbreakepidemiologyprevention and control strategy
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