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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/12475

Title: Assessments of the transmission of Onchocerca volvulus by Simulium sanctipauli in the Upper Denkyira District, Ghana, and the intermittent disappearance of the vector
Authors: Garms, R.
Badu, K.
Owusu-Dabo, E.
Baffour-Awuah, S.
Adjei, O.
et. al
Keywords: Onchocerciasis
Vectorial efficiency
Infection rate
Parasite reservoir
Gold mining
Issue Date: 17-Jan-2015
Publisher: Springer-Verlag Berlin Heidelberg
Citation: Parasitol Res (2015) 114:1129–1137 DOI 10.1007/s00436-014-4287-9
Abstract: Following studies on the transmission of Onchocerca volvulus (Leuckart) by Simulium sanctipauli Vajime & Dunbar (Diptera, Simuliidae) in Upper Denkyira District in Ghana in 2001 and 2002 (Kutin et al., Med Vet Ent 18:167–173, 2004), further assessments were carried out in 2006 and 2013/2014 to determine whether transmission parameters had changed since community-directed ivermectin treatment (CDTI) began in 1999. There were no marked changes of the transmission intensities in 2006. Only slight, but non-significant, reductions were observed in infection rates of parous flies with larval stages (L1–L3) of O. volvulus from 44.1 % (of 1672 parous flies) in 2001/2002 to 42.1 % (506) in 2006 and from 6.5 to 5.9 % of flies carrying infective larvae in their heads. This suggested that there was an ongoing transmission in the area and the parasite reservoir in the human population was still high. Unexpectedly, further assessments conducted in October 2013 and March and October 2014 revealed that the vector S. sanctipauli had apparently disappeared and transmission had ceased, probably as a result of intensified gold mining activities along the rivers Ofin and Pra. The water of both rivers was extremely turbid, heavily loaded with suspended solids, probably preventing the development of blackfly larvae. Some breeding and biting of Simulium yahense Vajime & Dunbar was observed in a small tributary of the Pra, the Okumayemfuo, which is not affected by gold mining. However, the infection rate of flies was low, only 3.7 % of 163 parous flies were infected with first stage (L1) larvae of O. volvulus.
Description: An article published by Springer-Verlag Berlin Heidelberg and also available at DOI 10.1007/s00436-014-4287-9
URI: http://hdl.handle.net/123456789/12475
Appears in Collections:College of Science

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