Analysis on the surveillance results of dengue vector Aedes in Chongqing area from 2019 to 2023

doi:10.20199/j.issn.1672-2302.2024.04.003

Abstract

Abstract:

Objective To understand the density and seasonal fluctuation of Aedes mosquitoes, vectors of dengue fever, in Chongqing area for scientific basis to formulate corresponding prevention and control strategies for dengue fever. Methods The results of Aedes vector surveillance were collected from 39 districts (counties) in Chongqing area from 2019 to 2023. The surveillance was monthly conducted every year from April to November. The adult and juvenile Aedes vector mosquitoes were monitored in different habitats across the city by double-layer tent method and Breitau index method, respectively. The data of dengue fever cases reported in Chongqing area in the corresponding periods were collected through China Disease Prevention and Control Information System and analyzed. Results From 2019 to 2023, the average net lure index of adult mosquitoes was 1.63 mosquitoes / (net·h), and the net lure index were 2.23, 1.82 and 0.83 mosquitoes / (net·h), respectively, for residential areas, old tire dump/scrap station/construction sites and park/bamboo forests. The average Braito index of mosquito larvae was 5.25, and the average annual Braito index were 66.77 and 20.64, respectively for waste dumps and hospitals. The annually Braito index were relatively lower in residential areas (4.38), parks (4.12) and construction sites (2.46). From 2019 to 2023, a total of 1 539 cases of dengue fever were reported in Chongqing area, including 269 imported cases and 1 270 local infections. Cases were mainly reported in 2019 (168 imported cases and 1 243 local cases) and 2023 (95 imported cases and 27 local cases). All local infections were concentrated between August and November. The number of imported cases was correlated with the number of local infections (r=0.857, P<0.05). Conclusion The surveillance and control of Aedes vector in residential areas, hospitals, waste dumps and other habitats should be intensified in Summer and Autumn to control the mosquito vector density within the transmission risk threshold. Meanwhile, the possibility of local cases or even spot clusters caused by imported cases should be prevented.

Key words: Dengue fever, Transmission vector, Aedes, Monitoring, Chongqing City

CLC Number:

R512.8，R384.1

XIAO Hansen, TU Taotian, WANG Zheng, ZHANG Ying, WEI Jing, JI Hengqing. Analysis on the surveillance results of dengue vector Aedes in Chongqing area from 2019 to 2023[J]. Journal of Tropical Diseases and Parasitology, 2024, 22(4): 204-207.

Figures/Tables 6

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References 17

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年份	伊蚊成蚊监测			伊蚊幼蚊监测
年份	布放蚊帐数（顶·次）	捕获伊蚊数（只）	帐诱指数 [只/（顶·h）]	调查户数（户）	调查积水容器数 [个（处）]	阳性容器数 [个（处）]	BI值
2019	940	964	2.05	31 295	50 843	1 081	3.45
2020	937	628	1.34	31 207	60 478	1 915	6.14
2021	936	589	1.26	31 015	64 336	1 593	5.14
2022	938	601	1.28	31 134	54 353	1 124	3.61
2023	942	1 041	2.21	32 570	63 373	2 541	7.80
合计	4 693	3 823	1.63	157 221	293 383	8 254	5.25

生境类型	2019年	2020年	2021年	2022年	2023年	平均
居民区	2.50	1.15	1.15	1.80	4.57	2.23
公园/竹林	1.08	1.09	1.09	0.57	0.31	0.83
旧轮胎堆放地/废品站/工地	2.58	1.81	1.57	1.39	1.76	1.82

生境类型	2019年	2020年	2021年	2022年	2023年	平均
居民区	3.01	4.80	4.45	2.71	6.94	4.38
医院	6.34	38.03	7.69	25.35	25.81	20.64
公园	3.25	5.56	8.96	2.84	0.00	4.12
工地	1.63	4.79	3.51	0.00	2.38	2.46
废旧物品堆放处	46.15	62.75	41.03	28.38	155.56	66.77

月份	媒介伊蚊监测平均值		登革热病例数平均值
月份	帐诱指数[只/（顶·h）]	BI值	输入性病例数（例）	本地病例数（例）
4月	0.70	3.35	2	0
5月	1.38	3.56	4	0
6月	2.33	5.92	5	0
7月	2.63	6.98	7	0
8月	2.21	6.10	7	12
9月	1.89	9.82	16	175
10月	1.46	4.74	8	65
11月	0.55	1.72	2	2