Epidemiological characteristics of dengue fever in Shenzhen in 2014

ZENG Yu-hua

doi:10.3969/j.issn.1007-8134.2016.05.008

Abstract：Objective To analyze characteristics and risk factors of dengue fever (DF) in Shenzhen in 2014 and provide evidences for following actions of prevention and control. Methods The relevant data of DF were collected from Shenzhen Center for Disease Prevention and Control in 2014, and the incidence of DF in time and space, population distribution and serotype characteristics were anayzed by the method of descriptive epidemiology, combined with the case of DF epidemiological data and clinical information.Results A total of 454 cases of DF and 2 outbreak cases including 346 local cases were reported as well as 108 external cases in 2014, and there was no the second generation cases or deaths. The incidence in young adults aged 20 ~ 50 accounted for 76.73% of the total; Male’s accounted for 60.13%, slightly higher than that in female. The outbreak time was mainly from June to December, and the number of reported cases accounted for 97.14% of the total within September to November. Although there was epidemic situation in each district, the most DF cases are reported in Baoan , Futian and Nanshan, which took up more than 60.00% of the total. Sixty-five strains of dengue viruses (DENV) were isolated from 100 patients blood specimens, including 59 type I, 4 type II, 2 type III and 1 type IV. In 2014, the center had collected 352 blood samples from the normal group, which found 11 cases specific IgG antibody positive, and the overall positive rate of antibody was 3.13%. Conclusions According to 2014 DF epidemic outbreak characteristics, it is showing time, geographical and age characteristics. And epidemiological characteristics of infectious population and serum antibody level of normal population are not embodied with local characteristics.