Surveillance of the population density of Aedes albopictus larvae in dengue prone and risk areas of Zhejiang province, China, 2020

doi:10.11853/j.issn.1003.8280.2022.01.004

Abstract

Abstract: Objective To investigate the population density and seasonal variation of Aedes albopictus larvae in dengue prone and risk areas of Zhejiang province, China, 2020, and to provide basic data for the surveillance, prevention, and control of dengue fever. Methods Six surveillance sites were selected based on the presence or absence of local dengue fever cases in the past. In April to December 2020, mosq-ovitrap and Breteau index (BI) were used to monitor the population density of Ae. albopictus every 10 days of each month; Excel 2010 software was used for data arrangement, and GraphPad Prism 6 software was used to analyze the difference and correlation between mosq-ovitrap index (MOI) and BI. Results The mean MOI was 4.75, and the positive mosq-ovitraps containing both eggs and larvae had the highest proportion of 45.52%; the surveillance sites with local dengue fever cases in the past had a significantly higher MOI than those without local cases (5.72 vs. 3.73, χ²=64.050, P <0.05). The mean BI was 11.64, and idle containers (bowls, bottles, jars, and tanks) had the highest proportion of 56.13%; the surveillance sites with local dengue fever cases in the past had a significantly higher BI than those without local cases (15.54 vs. 7.63, χ²=391.800, P<0.05). MOI was positively correlated with BI in rural residential areas (r=0.739, P<0.05), while there was no statistical correlation between MOI and BI in urban residential areas (r=0.499, P=0.171). Conclusion There is a risk of dengue fever transmission in April-November in Zhejiang province, and the investigation results show that both MOI and BI can reflect the population density of Ae. albopictus larvae, which can be used to monitor the population density of dengue vector Aedes.

Key words: Dengue fever, Aedes albopictus, Population density, Zhejiang province

摘要： 目的分析浙江省登革热重点地区2020年白纹伊蚊种群密度、季节消长变化，为登革热监测及防控提供基础数据。方法根据既往有和无登革热本地病例选取6个监测点，于2020年4－12月采用诱蚊诱卵器法和布雷图指数（BI）法监测白纹伊蚊种群密度，以旬为单位开展监测；利用Excel 2010软件进行数据整理，GraphPad Prism 6软件分析平均诱蚊诱卵指数（MOI）及BI的差异性和相关性。结果平均MOI为4.75，以卵和幼蚊共有的阳性诱蚊诱卵器数占比最高（45.52%）；既往有登革热本地病例的监测点MOI（5.72）高于既往无登革热本地病例监测点的MOI（3.73），二者差异有统计学意义（χ²=64.050，P<0.05）。平均BI为11.64，其中以闲置容器（碗、瓶、缸、罐）占比最高（56.13%）；既往有登革热本地病例的监测点BI（15.54）高于既往无登革热本地病例监测点的BI（7.63），二者差异有统计学意义（χ²=391.800，P<0.05）。农村居民区MOI和BI呈正相关（r=0.739，P<0.05），但城镇居民区二者差异无相关性（r=0.499，P=0.171）。结论浙江省4－11月均存在登革热传播风险，调查结果显示MOI和BI值均能较好地反映出白纹伊蚊幼蚊种群密度特征，可用于登革热媒介伊蚊种群密度监测。

关键词: 登革热, 白纹伊蚊, 种群密度, 浙江省

CLC Number:

LI Tian-qi, LIU Qin-mei, WU Yu-yan, LUO Ming-yu, WANG Jin-na, GONG Zhen-yu. Surveillance of the population density of Aedes albopictus larvae in dengue prone and risk areas of Zhejiang province, China, 2020[J]. Chinese Journal of Vector Biology and Control, 2022, 33(1): 21-24.

李天奇, 刘钦梅, 吴瑜燕, 罗明宇, 王金娜, 龚震宇. 浙江省登革热重点地区2020年白纹伊蚊幼蚊种群密度监测分析[J]. 中国媒介生物学及控制杂志, 2022, 33(1): 21-24.

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