Surveillance results of the main vectors in Liaoning province of China in 2020

WANG Chun-yu, ZHANG Jia-yong, BAI Yu-yin, DING Jun

doi:10.11853/j.issn.1003.8280.2022.01.014

Chinese Journal of Vector Biology and Control >

2022 , Vol. 33 >Issue 1: 76 - 82

DOI: https://doi.org/10.11853/j.issn.1003.8280.2022.01.014

Vector Surveillance

Surveillance results of the main vectors in Liaoning province of China in 2020

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Institute for Infectious and Communicable Disease Control and Prevention, Liaoning Provincial Center for Disease Control and Prevention, Shenyang, Liaoning 110005, China

Received date: 2021-09-02

Online published: 2022-02-17

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Abstract

Objective To investigate the density, species composition, dynamic variation, and changing trend of four major vectors in Liaoning province of China, i.e., rodents, mosquitoes, flies, and cockroaches, and to provide a scientific basis for the prevention and control of vectors and vector borne infectious diseases. Methods From January to December in 2020, the night trapping method and the sticky trap method were used for the surveillance of rodents and cockroaches in odd months, and the light trapping method and the cage trapping method were used for the surveillance of mosquitoes and flies from May to October, respectively. Vector surveillance data were collected from the surveillance sites in 14 prefectures of Liaoning province, and Excel 2010 and SPSS 23.0 softwares were used for statistical analysis. Results In 2020, the density of rodents in Liaoning province was 0.91 rodents/100 traps and reached the peak of 1.14 rodents/100 traps in September; as for habitats, rural natural villages had the highest rodent density of 1.28 rodents/100 traps, and there was a statistical difference in the seasonal variation of rodent density between different habitats (χ²=25.986, P<0.05); the dominant species was Rattus norvegicus, accounting for 77.69% of the total rodents captured. The density of mosquitoes was 45.67 mosquitoes/lamp·night and reached the peak of 112.20 mosquitoes/lamp·night in late July; as for habitats, livestock shed had the highest mosquito density of 160.07 mosquitoes/lamp·night, and there was a statistical difference in the seasonal variation of mosquito density between different habitats (χ²=33.115, P<0.05); the dominant species was Culex pipiens pallens, accounting for 27.99%. The density of flies was 6.97 flies/cage·hour and reached the peak of 11.56 flies/cage·hour in July; as for habitats, farmers’ market had the highest fly density of 11.12 flies/cage·hour, and there was a significant difference in the seasonal variation of fly density between different habitats (χ²=12.783, P<0.05); the dominant species was Lucilia sericata with a composition ratio of 44.77%. Cockroaches had a density of 0.62 cockroaches/paper and an infestation rate of 7.45%, and the density and infestation rate of cockroaches reached the peaked in September; serious infestation and a high density of cockroaches were observed in the key places such as farmer’ market and supermarket, and there was a statistical difference in the seasonal variation of cockroach density between different habitats (χ²=26.104, P<0.05); the absolute dominant species was Blattella germanica, accounting for 99.16%. Conclusion This study helps to gain a better understanding of the density, species composition, and dynamic variation of the main vectors in Liaoning province in 2020, and it is suggested that all cities adopt targeted and integrated control measures according to the results of vector surveillance in Liaoning province, so as to reduce the density of vectors and control related diseases.

Key words： Vector; Density; Species composition; Surveillance; Habitat

Cite this article

WANG Chun-yu, ZHANG Jia-yong, BAI Yu-yin, DING Jun . Surveillance results of the main vectors in Liaoning province of China in 2020[J]. Chinese Journal of Vector Biology and Control, 2022 , 33(1) : 76 -82 . DOI: 10.11853/j.issn.1003.8280.2022.01.014

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