An analysis of surveillance results of malaria vectors <i>Anopheles</i> in Jiangxi province, China, 2018

GONG Yan-feng, LEI Lei, LI Zhi-hong, SHANGGUAN Jun, LI Zi-fen, ZHENG Jian-gang

doi:10.11853/j.issn.1003.8280.2020.01.006

Chinese Journal of Vector Biology and Control >

2020 , Vol. 31 >Issue 1: 27 - 31

DOI: https://doi.org/10.11853/j.issn.1003.8280.2020.01.006

Original Reports

An analysis of surveillance results of malaria vectors Anopheles in Jiangxi province, China, 2018

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Jiangxi Province Center for Disease Control and Prevention, Nanchang 330029, Jiangxi Province, China

Received date: 2019-09-30

Online published: 2020-02-20

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Supported by the Science and Technology Plan of Health Commission of Jiangxi Province (No. 20156005)

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Abstract

Objective To master the species and population density of malaria vectors Anopheles after malaria elimination in Jiangxi province, China, and to provide a scientific basis for the risk assessment of malaria transmission and development of effective control measures. Methods From June to October, 2018, 28 malaria vector surveillance sites were set up in different terrains such as plain, hilly, and mountainous areas in Jiangxi province. Investigation of malaria vector, Anopheles mosquitoes, was conducted by the indoor and outdoor overnight lamp trapping method. Through identification of Anopheles species and calculation of the indoor and outdoor Anopheles density at each surveillance site, the species composition of malaria vectors and population density difference of Anopheles mosquitoes in indoor and outdoor areas and different terrains, as well as the seasonality of Anopheles mosquitoes, were analyzed. Results A total of 8 665 Anopheles mosquitoes were captured, and all of them were identified as An. sinensis. There were 2 508 An. sinensis captured indoors and 6 157 captured outdoors, with mean densities of 8.96 mosquitoes/lamp·night and 21.99 mosquitoes/lamp·night, respectively. There were significant differences in the number of Anopheles mosquitoes and mean density between indoors and outdoors (all t=2.518, P=0.016). In 28 surveillance sites, Jinggangshan had the highest indoor and outdoor mean densities of Anopheles mosquitoes, as 66.90 mosquitoes/lamp·night and 112.80 mosquitoes/lamp·night, respectively, while Longnan had the lowest mean densities as 0 and 1.20 mosquitoes/lamp·night, respectively. There was no significant difference in either indoor or outdoor mean density of Anopheles mosquitoes between plain, hilly, and mountainous areas (F=0.729, P=0.492 for indoors, F=1.586, P=0.225 for outdoors). The indoor and outdoor mean densities of Anopheles mosquitoes peaked in the first ten days of July, as 14.32 mosquitoes/lamp·night for indoors and 31.50 mosquitoes/lamp·night for outdoors. Conclusion Anopheles sinensis is widely distributed in Jiangxi province, with a high population density, and is identified as the dominant species of malaria vectors, which makes the transmission of imported malaria at potential risk. Therefore, malaria surveillance should be strengthened by the local health authority to prevent local cases caused by imported cases.

Key words： Malaria vector; Surveillance; Population composition; Jiangxi

Cite this article

GONG Yan-feng, LEI Lei, LI Zhi-hong, SHANGGUAN Jun, LI Zi-fen, ZHENG Jian-gang . An analysis of surveillance results of malaria vectors Anopheles in Jiangxi province, China, 2018[J]. Chinese Journal of Vector Biology and Control, 2020 , 31(1) : 27 -31 . DOI: 10.11853/j.issn.1003.8280.2020.01.006

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