Abstract: Objective To investigate epidemiological characteristics of imported dengue fever in Daozhen county, the species and density of local Aedes mosquitoes, and provide basis for prevention and control. Methods Epidemiological investigation was carried out on dengue fever cases and other returnees in July 2016. The dengue IgM antibody of the serum returnees were detected by ELISA, and investigating the Aedes mosquitoes in the town where the cases reside was carried out by human baiting and Breteau index(BI). Results There were 5 clinical cases, 2 suspected cases, 1 asymptomatic infection among all 26 returnees from Maldives, with morbidity rate 30.77%. Six sera were positive for dengue IgM antibody, 7 cases were treated and recovered. Other 19 asymptomatic individuals were quarantined for 14 d, and no new clinical cases emerged. Investigating the Aedes mosquitoes in towns of Yuxi, Hekou, and Zongping revealed that landing rate on human was 2.4, the mosquito density was more than C level (human landing rate less than 1.5). BI was 7.0, slightly higher than the threshold for the spread of dengue fever (BI ≤ 5). Conclusion An imported dengue fever outbreak from Maldives occurred in Daozhen county in 2016. There was no secondary dengue transmission locally, because of the effective preventive measures.

Key words: Dengue fever, Imported epidemic, Aedes albopictus

摘要： 目的 调查贵州省道真县输入性登革热疫情流行病学特点及媒介伊蚊种类及其密度，为防控工作提供依据。方法 采用个案调查表对2016年7月道真县马尔代夫归国人员中的登革热病例进行流行病学调查；利用ELISA方法对归国人员血清进行IgM抗体检测；采用人诱法和布雷图指数（BI）法对媒介伊蚊密度进行调查。结果 26名归国务工人员中，登革热IgM抗体阳性6份，其中临床诊断病例5例，疑似病例2例，隐性感染者1例，罹患率为30.77%。7例患者经治愈出院，其余19人隔离观察14 d未发病。道真县玉溪镇、河口乡和棕坪镇的媒介伊蚊监测人诱停落指数为2.4只/（人·h），超过C级[人诱停落法≤ 1.5只/（人·h）]水平；BI为7.0，略高于控制登革热传播的阈值（BI ≤ 5）。结论 该起登革热输入性疫情得到有效控制，未引起本地流行。

关键词: 登革热, 输入性疫情, 白纹伊蚊