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Seasonal fluctuations of Simulium damnosum complex and Onchocerca microfilarial evaluation in river systems, South-west Nigeria

Published online by Cambridge University Press:  01 March 2013

S.O. Sam-Wobo*
Affiliation:
Department of Biological Sciences, Federal University of AgriculturePMB 2240, Abeokuta, Nigeria
M.A. Adeleke
Affiliation:
Department of Biological Sciences, Osun State University, Osogbo, Nigeria
O.A. Jayeola
Affiliation:
Department of Forestry and Wildlife Management, Federal University of Agriculture, PMB 2240, Abeokuta, Nigeria
A.O. Adeyi
Affiliation:
Department of Zoology, University of Ibadan, Ibadan, Nigeria
A.S. Oluwole
Affiliation:
Department of Biological Sciences, Federal University of AgriculturePMB 2240, Abeokuta, Nigeria
B. Adewale
Affiliation:
Nigerian Institute for Medical Research, Yaba-Lagos, Nigeria
C.F. Mafiana
Affiliation:
National Universities Commission, Abuja, Nigeria
Y. Bissan
Affiliation:
WHO Multi-Disease Surveillance Centre, Ouagadougou, Burkina Faso
L. Toé
Affiliation:
WHO Multi-Disease Surveillance Centre, Ouagadougou, Burkina Faso
L. Yameogo
Affiliation:
African Programme for Onchocerciasis Control, Ouagadougou, Burkina Faso
E. Mutabaruka
Affiliation:
WHO Multi-Disease Surveillance Centre, Ouagadougou, Burkina Faso
U.V. Amazigo
Affiliation:
African Programme for Onchocerciasis Control, Ouagadougou, Burkina Faso
*
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Abstract

Seasonal fluctuations of the Simulium damnosum Theobald complex and the prevalence of Onchocerca volvulus Bickel in blackflies caught in river systems bordering the Nigeria–Benin border were assessed for their direct impact on the epidemiology of onchocerciasis in South-western Nigeria. Entomological evaluation and heteroduplex assay (HDA) techniques were performed on flies caught in the eight capture points in the Ogun and Yewa river systems between October and December 2007, July and December 2008 and May and December 2009. A total of 5789 blackflies were caught on human bait, of which 727 (12.6%) flies were captured in 2007, 1723 (29.8%) in 2008 and 3339 (57.6%) in 2009. The majority of flies caught during the study were forest flies representing 90.3% of the total catch while savanna flies constituted 9.7%. Proportions of parous to nulliparous flies were low in all the catching points (31.1 and 68.9%, respectively). Of the 5789 flies dissected, 11 (0.2%) flies were infected with Onchocerca parasites with nine of the infected flies having L3 head parasites. The HDA results revealed that the Beffa form of S. soubrense was the dominant cytospecies present (87.1%) in all the capture sites when compared with 12.9% of S. damnosum s.s. The low level of infectivity of flies may therefore indicate a low transmission level of onchocerciasis in the communities along the Ogun and Yewa river systems. However, there is a need for constant surveillance on species composition and fly infectivity in the river systems along the borders of Nigeria–Benin Republic.

Type
Research Papers
Copyright
Copyright © ICIPE 2013

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