Entomological studies were conducted in paired study villages in three of the five study areas used for the epidemiological assessment of the Gambia's National Impregnated Bednet Programme.
Baseline data collected in 1991 were compared with post-intervention data from 1992, when one of each village pair was included in the treatment programme in which villagers'nets were dipped in permethrin.
In a longitudinal study, indoor-resting densities of Anopheles gambiae s.l. in the treated villages were significantly reduced, when compared with their paired untreated village, in areas II (t=3.32,13 degrees of freedom, P=0.006) and III (t=3.71,13 degrees of freedom, P=0.003).
However, this was not associated with higher outdoor-biting rates in the evenings in the treated villages than in the controls.
There was no significant decrease in the sporozoite rate in the treated village in area V in 1992, despite the fact that this village was over 5 km from its nearest neighbouring village.
However, the proportion of villagers sleeping under a treated net in this village was<50%. No clear evidence for an epidemiologically significant'mass killing effect'resulting from the village-wide use of treated nets, emerges in this or any other study undertaken in The Gambia.
We must conclude that, on a national scale, the nets provide an exceptionally high level of personal rather than community protection.
The mechanisms underlying the personal protection are, however, still unclear.
Mots-clés Pascal : Programme sanitaire, Lutte phytosanitaire, Evaluation, Entomologie, Insecticide, Homme, Gambie, Afrique, Moustiquaire
Mots-clés Pascal anglais : Sanitary program, Pest and disease control, Evaluation, Entomology, Insecticide, Human, Gambia, Africa
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 95-0416069
Code Inist : 002A37A. Création : 01/03/1996.