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

Lamberton, PHL and Cheke, RA and Walker, M and Winskill, P and Osei-Atweneboana, MY and Tirados, I and Tetteh-Kumah, A and Boakye, DA and Wilson, MD and Post, RJ and Basanez, M-G (2014) Onchocerciasis transmission in Ghana: biting and parous rates of host-seeking sibling species of the Simulium damnosum complex. PARASITES & VECTORS, 7 (511). pp. 1-23. ISSN 1756-3305

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Abstract

Background: Ghana 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. Methods: We 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.
Results: S. 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.

Item Type: Article
Additional Information: Biomed Central licence available at: http://www.biomedcentral.com/about/license
Uncontrolled Keywords: 1108 Medical Microbiology, 1117 Public Health And Health Services
Subjects: R Medicine > R Medicine (General)
R Medicine > RB Pathology
Divisions: Natural Sciences and Psychology
Publisher: BIOMED CENTRAL LTD
Related URLs:
Date Deposited: 02 Mar 2015 12:40
Last Modified: 02 Mar 2015 14:13
DOI or Identification number: 10.1186/s13071-014-0511-9
URI: http://researchonline.ljmu.ac.uk/id/eprint/553

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