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A survey of the distribution of
Anopheles
malaria vectors after elimination of malaria in Dali prefecture, Yunnan province, China
ZUO Li-juan, KE Chun-rong, LIU Ying, LUO Jian-long
Abstract
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282
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Objective
To investigate the distribution of malaria vectors
Anopheles
after the elimination of malaria in 12 counties and cities in Dali Bai autonomous prefecture (Dali prefecture), Yunnan province, China; to assess the local risk of imported malaria retransmission, and to provide a basis for consolidating local achievements of malaria elimination and formulating local technical schemes for preventing imported malaria retransmission after elimination of malaria.
Methods
The study was conducted from July to September in 2017. According to the altitude, each county (city) was divided into high, middle, and low stratifications, and one natural village from each stratification was selected as the survey site. The all-night light trapping method and half-night human-bait method were used. One barn or human room in the east, west, south, north, and middle of each survey site was selected as an observation point. The all-night light trapping method was used to catch mosquitoes at each survey site for 3 consecutive nights per month, and the half-night human-bait method was used to catch mosquitoes at each low-altitude survey site once a month.
Results
A total of 13 species of
Anopheles
mosquitoes were captured, among which
An. sinensis
was distributed in all these 12 counties and cities;
An. minimus
was only caught in Yunlong county;
An. kunmingensis
was distributed in 7 counties and cities, i.e., Xiangyun county, Jianchuan county, Binchuan county, Heqing county, Eryuan county, Weishan county, and Dali city. The results of all-night light trapping method showed that Xiangyun county had the highest density of
Anopheles
mosquitoes (164.55 mosquitoes/light·night). The results of half-night human-bait method showed that only Jianchuan county and Heqing county had
Anopheles
mosquitoes caught, and the densities were 0.72 mosquitoes/net·h and 0.06 mosquitoes/net·h, respectively.
Conclusion
Considering the imported malaria cases in 2018-2020, Dali city is at risk of retransmission of
Plasmodium vivax
; Yunlong county is potentially at risk of retransmission of multiple malaria; the other 10 counties are all potentially at risk of retransmission of
P. vivax
. It is suggested that related departments should keep strengthening the team building for malaria control and the surveillance work of malaria vectors
Anopheles
.
2021, 32 (5): 551-552.
doi:
10.11853/j.issn.1003.8280.2021.05.008
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Analysis on the monitoring results of the major host animals of vole plague in Western Yunnan from 2005 to 2008
LUO Jian-long, LI Rui-zhong, KE Chun-rong, HE She-ji, WANG Hong
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1140
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2010, 21 (6): 621-621.
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Role of V?shaped river groove in the elimination of mosquito, mouse and oncomelania breeding sites
KE Chun-Rong, YANG Hui, CHEN Bai-Yun, LI Hong-Jun, ZHOU Shi-Sheng, DUAN Bing-Hua
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842
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934
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2009, 20 (5): 487-.
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One case-report of Kala-azar in Dali prefecture
CHEN Bai-Yun, MA Shun-Gao, KE Chun-Rong, WANG Qing-Chun, ZHOU Jun
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602
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2009, 20 (3): 205-.