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Onchocerciasis transmission in Ghana: biting and parous rates of host-seeking sibling species of the Simulium damnosum complex

机译:加纳的盘尾丝虫病传播:Simulium damnosum复合体的寄主寻求同胞物种的咬伤和分生率

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摘要

Background: udGhana is renowned for its sibling species diversity of the Simulium damnosum complex, vectors of Onchocerca volvulus. Detailed entomological knowledge becomes a priority as onchocerciasis control policy has shifted from morbidity reduction to elimination of infection. To date, understanding of transmission dynamics of O. volvulus has been mainly based on S. damnosum sensu stricto (s.s.) data. We aim to elucidate bionomic features of vector species of importance for onchocerciasis elimination efforts.ud udMethods: udWe collected S. damnosum sensu lato from seven villages in four Ghanaian regions between 2009 and 2011, using standard vector collection, and human- and cattle-baited tents. Taxa were identified using morphological and molecular techniques. Monthly biting rates (MBR), parous rates and monthly parous biting rates (MPBR) are reported by locality, season, trapping method and hour of collection for each species.ud udResults:udS. damnosum s.s./S. sirbanum were collected at Asubende and Agborlekame, both savannah villages. A range of species was caught in the Volta region (forest-savannah mosaic) and Gyankobaa (forest), with S. squamosum or S. sanctipauli being the predominant species, respectively. In Bosomase (southern forest region) only S. sanctipauli was collected in the 2009 wet season, but in the 2010 dry season S. yahense was also caught. MBRs ranged from 714 bites/person/month at Agborlekame (100% S. damnosum s.s./S. sirbanum) to 8,586 bites/person/month at Pillar 83/Djodji (98.5% S. squamosum). MBRs were higher in the wet season. In contrast, parous rates were higher in the dry season (41.8% vs. 18.4%), resulting in higher MPBRs in the dry season. Daily host-seeking activity of S. damnosum s.s./S. sirbanum was bimodal, whilst S. squamosum and S. sanctipauli had unimodal afternoon peaks.ud udConclusions:udThe bionomic differences between sibling species of the S. damnosum complex need to be taken into account when designing entomological monitoring protocols for interventions and parameterising mathematical models for onchocerciasis control and elimination.
机译:背景: udGhana因其白僵菌(Simulium damnosum)的同胞物种多样性而闻名,该物种是圆盘锦鲤的媒介。随着盘尾丝虫病控制政策已从减少发病率转向消除感染,详细的昆虫学知识成为当务之急。迄今为止,对螺牙transmission传播动力学的了解主要是基于S.damnosum sensustricto(s.s。)数据。我们旨在阐明对消除盘尾丝虫病的努力具有重要意义的媒介物种的生物特征。牛棚。使用形态学和分子技术鉴定了分类单元。按物种的所在地,季节,诱捕方法和收集时间报告月咬率(MBR),产卵率和月咬率(MPBR)。 ud udResults: udS。丹尼苏姆公司在两个大草原村的Asubende和Agborlekame都收集到了瑟伯娜。在沃尔特地区(森林-热带草原马赛克)和格安科巴亚(森林)中捕获了一系列物种,其中鳞翅目沙门氏菌或桑氏沙门氏菌分别为主要物种。在Bosomase(南部森林地区),2009年雨季仅收集了S. sanctipauli,但在2010年旱季也捕获了S. yahense。 MBRs范围从Agborlekame(100%。damnosum s.s.s.S.sirbanum)714口/人/月到Pillar 83 / Djodji(98.5%S. squamosum)的8,586口/人/月。雨季的MBR较高。相反,旱季的产卵率较高(分别为41.8%和18.4%),导致旱季的MPBR较高。 S.damnosum s.s./S。的每日寄主寻找活动。 sirbanum是双峰的,而S. squamosum和S. sanctipauli具有单峰的下午峰。 ud ud结论: ud在设计用于干预措施和参数化的昆虫学监测方案时,应考虑到S. damnosum复合物同胞物种之间的生物学差异。控制和消除盘尾丝虫病的数学模型。

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