A survey of malaria vectors feeding preference, biting site and resting behaviour in the malaria elimination settings of Dembiya District, north-western Ethiopia.

IF 2.4 3区 医学 Q3 INFECTIOUS DISEASES
Mihretu Tarekegn, Sisay Dugassa, Yohannes Negash, Habte Tekie, Yitbarek Woldehawariat
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Abstract

Background: Despite the progress in scaling vector control interventions in Ethiopia, malaria is still a major health problem in the country. Monitoring of the local vector populations and the effectiveness of vector control strategies is necessary to guide programme decisions to optimize malaria prevention efforts. This study investigated the feeding preference, the biting behaviour and resting behaviours of Anopheles mosquitoes in selected localities of Dembiya District.

Methods: Adult Anopheles mosquitoes were sampled indoors and outdoors from June 2018 to May 2019 using CDC light traps, pyrethrum spray catches, artificial pit shelters, and mouth aspirators at both Guramba Bata and Arebiya study sites. Anopheles mosquitoes were identified to the species level. Their blood meal source and Plasmodium sporozoite infections were determined using an enzyme-linked immunosorbent assay.

Results: Anopheles mosquitoes belonging to 11 species were identified from 2,055 collected mosquito specimens. Anopheles pharoensis was the predominant species at both the Guramba Bata (46.5%) and Arebiya (46.2%) study sites. The CDC light traps caught the highest number of Anopheles mosquitoes in both study sites. In Guramba Bata the density of outdoor host-seeking and resting Anopheles mosquitoes were higher than indoors (P ≤ 0.05). The human blood indexes (HBI) of indoor and outdoor host-seeking Anopheles arabiensis were 17.4% and 15.3%, respectively. The entomological inoculation rate (EIR) of outdoor host-seeking An. arabiensis was 4.7 infective bites/person/year. Additionally, the outdoor EIR of host-seeking Anopheles coustani was 25.7ib/p/year.

Conclusions: Anopheles mosquitoes in Dembiya district were more likely to seek a host and rest outdoors than indoors. A reevaluation of vector control strategies is needed to ensure Ethiopia remains on the path to malaria elimination. The detection of Plasmodium circumsporozoite protein in potential secondary vectors, such as An. coustani requires further investigation to substantiate their role in malaria transmission.

埃塞俄比亚西北部登比亚地区疟疾消除环境中疟疾病媒摄食偏好、叮咬地点和休息行为调查。
背景:尽管埃塞俄比亚在扩大病媒控制干预措施方面取得了进展,但疟疾仍然是该国的一个主要健康问题。有必要对当地病媒种群和病媒控制策略的有效性进行监测,以指导计划决策,优化疟疾预防工作。本研究调查了登比亚地区某些地方按蚊的取食偏好、叮咬行为和休息行为:2018年6月至2019年5月期间,在Guramba Bata和Arebiya研究地点使用CDC灯光诱捕器、除虫菊喷洒捕捉器、人工坑式庇护所和口吸器对室内和室外的成年疟蚊进行了采样。对疟蚊进行了物种鉴定。使用酶联免疫吸附试验确定了它们的血餐来源和疟原虫孢子虫感染情况:结果:从收集到的 2 055 份蚊子标本中鉴定出 11 个种的按蚊。在 Guramba Bata(46.5%)和 Arebiya(46.2%)研究地点,法罗疟蚊是主要的蚊种。在这两个研究地点,CDC 灯光诱捕器捕获的按蚊数量最多。在 Guramba Bata,室外寻找宿主和休息的按蚊密度高于室内(P ≤ 0.05)。室内和室外寻找宿主的阿拉伯按蚊的人血指数(HBI)分别为 17.4% 和 15.3%。室外寻找宿主的阿拉伯按蚊的昆虫学接种率(EIR)为 4.7 感染性叮咬/人/年。此外,室外寻找宿主的库斯坦尼按蚊的昆虫学接种率为 25.7ib/人/年:结论:与室内相比,登比亚地区的按蚊更倾向于在室外寻找宿主和休息。需要重新评估病媒控制策略,以确保埃塞俄比亚继续走在消灭疟疾的道路上。在库斯坦尼疟蚊等潜在的次要病媒中检测到环孢子虫疟原虫蛋白需要进一步调查,以证实它们在疟疾传播中的作用。
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来源期刊
Malaria Journal
Malaria Journal 医学-寄生虫学
CiteScore
5.10
自引率
23.30%
发文量
334
审稿时长
2-4 weeks
期刊介绍: Malaria Journal is aimed at the scientific community interested in malaria in its broadest sense. It is the only journal that publishes exclusively articles on malaria and, as such, it aims to bring together knowledge from the different specialities involved in this very broad discipline, from the bench to the bedside and to the field.
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