Objective To investigate the epidemiological characteristics of dengue fever in Zhejiang province, China, from 2015 to 2019 and the different characteristics of imported cases and local cases, and to provide a scientific basis for accurate prevention and control of dengue fever in Zhejiang province. Methods The data of dengue fever cases in Zhejiang province from 2015 to 2019 were collected from the China Information System for Disease Control and Prevention, and SPSS 20.0 software was used to perform descriptive and statistical analyses of related data of imported cases and local cases, including sex, age, occupation, seasonal distribution, geographic distribution, and interval from disease onset to confirmed diagnosis. Results A total of 2 532 dengue fever cases were reported in Zhejiang province from 2015 to 2019, among which there were 961 imported cases and 1 571 local cases. Among the 2 532 patients, there were 1 424 male patients and 1 108 female patients, and the male/female ratio was 1.90:1 in imported cases and 1.02:1 in local cases; the composition ratio of male patients in imported cases was significantly higher than that in local cases (χ2=54.626, P<0.001). The median age of all cases was 44 years, with an inter-quartile range of 32-58 years; the median age was 37 years for imported cases and 50 years for local cases, and the imported cases had a significantly younger age than local cases (Z=-15.681, P<0.001). The numbers of commercial service personnel, retired persons, workers, housekeeping and unemployed persons, farmers, and cadres were 474, 424, 352, 315, 287, and 214, respectively; commercial service personnel accounted for the highest proportion in imported cases, while retired persons accounted for the highest proportion in local cases; there was a significant difference in occupational distribution between imported cases and local cases (χ2=303.418, P<0.001). Imported cases were observed in each month, mainly June to October, and all local cases occurred in July to November. From 2015 to 2019, the number of counties (cities/districts) reporting dengue fever cases in Zhejiang province gradually increased year by year, and about 95.56% of the counties (cities/districts) reported dengue fever cases during the past 5 years, among which 48.89% reported local cases of dengue fever. Conclusion The epidemic situation of dengue fever in Zhejiang province becomes more severe year by year, and there are significant differences in sex, age, occupation, and disease onset between imported cases and local cases. Zhejiang province should adopt more precise and strict measures to reduce the epidemic risk of dengue fever according to epidemiological characteristics.
WANG Zhen, LING Feng, LIU Ying, REN Jiang-ping, SUN Ji-min
. Epidemiological characteristics of dengue fever in Zhejiang province, China, 2015-2019[J]. Chinese Journal of Vector Biology and Control, 2020
, 31(6)
: 643
-647
.
DOI: 10.11853/j.issn.1003.8280.2020.06.003
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