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Observations on Anopheles gambiae Giles s.l. (Diptera: Culicidae) during a trial of permethrin-treated bed nets in The Gambia

Published online by Cambridge University Press:  10 July 2009

R. W. Snow ,
M. Jawara  and
C. F. Curtis
R. W. Snow
Affiliation:
Medical Research Council Laboratories, Fajara, Banjul, Gambia
M. Jawara
Affiliation:
Medical Research Council Laboratories, Fajara, Banjul, Gambia
C. F. Curtis
Affiliation:
London School of Hygiene and Tropical Medicine, Keppel Street, London, WC1E 7HT, UK
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Abstract

In a Gambian village, the peak collections of females of the complex of Anopheles gambiae Giles occurred three months after the onset of the heaviest rains; 32% of these were A. melas Theobald, and 54% of blood-meals were identified as originating from man. Counts of A. gambiae s.l. in rooms containing permethrin-treated bed nets were compared with those in rooms containing placebo-treated nets. The numbers in the permethrin-treated nets were far lower than in placebo-treated nets. A higher rate of exophily was noted in rooms containing permethrin-treated nets. The numbers of unfed A. gambiae s.l. found inside the rooms with placebo-treated nets were significantly higher than those with permethrin-treated nets. However, the proportion fed and the mortality in the exit traps were not significantly affected by permethrin treatment. Three-minute bioassays conducted on four different fabric types impregnated at the same concentration showed that the toxicity varied between the fabrics. Handwashing severely reduced the toxicity and approximately halved the permethrin content. Bed nets are frequently washed in Gambian villages, and this could be a problem in the application of permethrin impregnation of bed nets for vector control. Methods are discussed to overcome this problem at the village level.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 77 , Issue 2 , June 1987 , pp. 279 - 286
Copyright
Copyright © Cambridge University Press 1987

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