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Diurnal Activity of Allopatric Populations of <I>Glossina pallidipes</I> and Hosts and their Implications on Risk of Transmission of Sleeping Sickness in Kenya

Author(s): S.O. Okoth | E.D. Kokwaro | J.M. Kiragu | G.A. Murilla

Journal: Journal of Entomology
ISSN 1812-5670

Volume: 4;
Issue: 1;
Start page: 20;
Date: 2007;
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Keywords: transmission | hosts | Glossina pallidipes | diurnal activity | seasons | Weather | sleeping sickness

G. pallidipes to estimate vector-host contact and risk of disease transmission within the dry and wet seasons. Results showed that vector activity was majorly influenced by temperature and relative humidity and the activity pattern was sensitive to seasons. Host movement significantly influenced vector movement in both dry and wet seasons at Nguruman, but only to a limited extent during the wet season at Busia. Host movement correlated positively with vector activity at high host densities while there was no definite correlation at low host densities. Vector-host contact was independent of prevailing weather conditions and seasons but was explained largely by random variability ascribable to innate spontaneous circadian rhythm of the vectors and the hosts. This implies that management of transmission risk in these two areas would largely depend on avoidance of contact between the vectors and hosts. This would require strategic livestock grazing patterns that is out-of-phase with peak vector activity periods to minimize contact.]]>
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