Background Domestic flies are accepted vectors of diarrhoea, but their role in trachoma transmission has never been quantified and no study has shown that fly control decreases the prevalence of trachoma.
We assessed the effect of fly control on public health in a pilot study in Gambian villages.
Methods We studied two pairs of villages-one pair in the 1997 wet season, and one pair in the 1998 dry season.
For each pair, deltamethrin was sprayed for 3 months to control flies in one village whilst the other was used as a control.
Fly populations were monitored with traps.
We surveyed trachoma at baseline and at 3 months, and collected daily data on diarrhoea in children aged between 3 months and 5 years.
Findings Fly control decreased numbers of muscid flies by around 75% in the intervention villages compared with controls.
Trachoma prevalence was similar at baseline (wet season, prevalence in intervention village 8.8% vs control 12.2% ; dry season, 18.0% vs 16.0%), but after 3 months of fly control there were 75% fewer new cases of trachoma in the intervention villages (wet season 3.7% vs 13.7% ; dry season 10.0% vs 18.9% ; rate ratio and relative risk of pooled data 0.25 [adjusted 95% Cl 0.09-0.64], p=0.003).
There was 22% less childhood diarrhoea in the wet season (14% vs 19%, period prevalence ratio 0.78 [0.64-0.95], p=0.01), and 26% less diarrhoea in the dry season (6% vs 8% ; 0.74 [0.34-1.59], p=0.60) compared with controls. (...)
Mots-clés Pascal : Diarrhée, Trachome, Chlamydiose, Bactériose, Infection, Transmission, Contamination, Vecteur, Insecta, Arthropoda, Invertebrata, Epidémiologie, Facteur risque, Prévention, Homme, Gambie, Afrique, Santé et environnement, Appareil digestif pathologie, Intestin pathologie, Oeil pathologie, Conjonctive pathologie, Mouche
Mots-clés Pascal anglais : Diarrhea, Trachoma, Chlamydiosis, Bacteriosis, Infection, Transmission, Contamination, Vector, Insecta, Arthropoda, Invertebrata, Epidemiology, Risk factor, Prevention, Human, Gambia, Africa, Health and environment, Digestive diseases, Intestinal disease, Eye disease, Conjunctiva disease
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0240782
Code Inist : 002B05B02A. Création : 16/11/1999.