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A preliminary survey of the epidemiology of bluetongue in Kenya

Published online by Cambridge University Press:  15 May 2009

A. R. Walker  and
F. G. Davies
A. R. Walker
Affiliation:
Department of Zoology, University College, Nairobi
F. G. Davies
Affiliation:
Kenya Veterinary Research Laboratory, P.O. Kabete, Kenya
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Summary

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A survey of the species composition and distribution of the Culicoides midge populations at a range of sites where bluetongue is enzootic isolated a group of dominant species: C. cornutus, C. grahamii, C. magnus, C. milnei, C. pallidipennis and C. 23.† Monthly light-trap sampling of Culicoides showed that the population densities of the dominant species greatly increased after the rain seasons and that these species concentrated around flocks of sheep and cattle. The larval habitats of C. cornutus and C. pallidipennis were found associated with stock pens. Precipitin tests on blood-fed Culicoides showed that most of the dominant species regularly feed on sheep and cattle. Bluetongue virus was isolated from C. milnei, C. pallidipennis and C. 23. Serological surveys of wild and domestic bovids from the enzootic area showed a high proportion with antibody to bluetongue virus. The colonization of C. cornutus, a potential vector, is described briefly. A causal relationship between peak rainfall in April-May, peak numbers of Culicoides in May-June and peak bluetongue incidence in June-July is postulated. The vector status of the above species and C. austeni was evaluated.

Type
Research Article
Information
Journal of Hygiene , Volume 69 , Issue 1 , March 1971 , pp. 47 - 60
Copyright
Copyright © Cambridge University Press 1971

References

REFERENCES

Atlas Of Kenya (1962). Survey of Kenya. Nairobi.Google Scholar
Bowne, J. G., Luedke, A. J., Jochim, M. M. & Foster, N. M. (1964). Current status of bluetongue in sheep. Journal of the American Veterinary Medical Association 144, 759–64.Google Scholar
Du Toit, R. M. (1944). Transmission of bluetongue and horsesickness by Culicoides. Onderste-poort Journal of Veterinary Science 19, 7–16.Google Scholar
Du Toit, R. M. (1962). The role played by bovines in the transmission of bluetongue in sheep. Journal of the South African Veterinary Medical Association 33, 483–90.Google Scholar
Foster, N. M., Jones, R. H. & Mccrory, B. R. (1963). Preliminary investigations on insect transmission of bluetongue in sheep. American Journal of Veterinary Research 24, 1195–200.Google Scholar
Foster, N. M., Jones, R. H. & Luedke, A. J. (1968). Transmission of attenuated and virulent bluetongue virus with Culicoides variipennis infected orally via sheep. American Journal of Veterinary Research 29, 275–9.Google Scholar
Jones, R. H. (1969). An improved larval medium for colonised Culicoides variipenis. Journal of Economic Entomology 62, 1483–6.Google Scholar
Kettle, D. S. (1951). The spatial distribution of Culicoides impunctatus under woodland and moorland conditions and its flight range through woodland. Bulletin of Entomological Research 42, 239–91.Google Scholar
Kettle, D. S. (1969). The ecology and control of blood sucking ceratopogonids. Acta Tropica 26, 235–48.Google Scholar
Khamala, C. P. M. (1968). Survey of the Culicoides of East Africa. Ph.D. thesis, University of East Africa, University College, Nairobi.Google Scholar
Owen, N. C., Du Toit, R. M. & Howell, P. G. (1965). Bluetongue in cattle. Onderstepoort Journal of Veterinary Research 32, 3–6.Google Scholar
Pini, A., Coakley, W. & Ohder, H. (1966). Concentration of bluetongue virus in experimentally infected sheep and virus identification by immune fluorescence technique. Archiv für die gesamte Virusforschung 18, 385–90.Google Scholar
Pini, A., Ohder, H., Whiteland, A. P. & Lund, L. J. (1968). Studies on the fluorescent and neutralising antibodies to bluetongue virus in sheep. Archiv für die gesamte Virusforschung 25, 128–36.Google Scholar
Pratt, D. J., Greenway, P. J. & Gwynne, M. D. (1966). A classification of East African rangeland. Journal of Applied Ecology 3, 369–82.Google Scholar
Price, D. A. & Hardy, W. T. (1954). Isolation of bluetongue virus from Texas sheep - Culicoides shown to be a vector. Journal of the American Veterinary Medical Association 124, 255–8.Google Scholar
Weitz, B. (1956). Identification of blood meals of blood sucking arthropods. Bulletin of the World Health Organization 15, 473–90.Google Scholar