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Tsetse–trypanosomiasis challenge to village N'Dama cattle in The Gambia: field assessments of spatial and temporal patterns of tsetse–cattle contact and the risk of trypanosomiasis infection

Published online by Cambridge University Press:  06 April 2009

T. J. Wacher ,
P. J. M. Milligan ,
P. Rawlings  and
W. F. Snow
T. J. Wacher
Affiliation:
International Trypanotolerance Centre, PMB 14, Banjul, The Gambia
P. J. M. Milligan
Affiliation:
Liverpool School of Tropical Medicine, Pembroke Place, Liverpool L3 5QA, UK
P. Rawlings
Affiliation:
International Trypanotolerance Centre, PMB 14, Banjul, The Gambia
W. F. Snow
Affiliation:
International Trypanotolerance Centre, PMB 14, Banjul, The Gambia
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Summary

The severity of the trypanosomiasis problem in a particular location is traditionally assessed in terms of a challenge index – the product of some measure of tsetse abundance and infection rate – which is assumed to be proportional to the force of infection. However, this index masks variation in the force of infection between herds and among individuals within herds. It is also not comparable between sites since the relative abundance of tsetse to hosts may vary. We have studied spatial distribution of herds of cattle in relation to tsetse in The Gambia and calculated an index of challenge based on the ratio of vectors to hosts over the livestock ranging area. This index is strongly correlated with estimates of the force of infection calculated from the incidence of infection in susceptible zebu; and it provides information on heterogeneity in exposure of different herds to tsetse.

Keywords

animal trypanosomiasischallengespatial heterogeneitytrypanotolerant cattle
Type
Research Article
Information
Parasitology , Volume 109 , Issue 2 , August 1994 , pp. 149 - 162
Copyright
Copyright © Cambridge University Press 1994

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