Spatial patterns of human water contact and Schistosoma mansoni transmission and infection in four rural areas in Machakos District, Kenya.
This paper presents the results of microgeographical studies of human water contact behavior and Schistosoma mansoni transmission levels and intensity of infection in four rural areas in Machakos District, Kenya.
The relationship between intensity of infection (geometric mean egg counts) in 3502 persons aggregated in 120 household clusters and eight independent variables was investigated using straight and stepwise linear regression and mapping techniques.
Results indicate that the two water contact variables, mean frequency per person and mean duration per person, as well as mean number of sites used per person, a transmission index and mean distance to the most frequently used site were the strongest predictors of geometric mean egg counts.
All three distance variables were usually negatively associated with infection although intensity of infection and water contact declined relatively slowly with distance from the streams.
This pattern appears to be owing to a combination of the relatively short distances, a general lack of safe alternative water sources and the use of more distant water contact sites both inside and outside the study area during periods of drought.
The study of snail-to-man transmission identified number of infected snails as the major transmission variable and number of contacts as the major predictor variable. (...)
Mots-clés Pascal : Schistosomiase, Trématodose, Helminthiase, Parasitose, Infection, Schistosoma mansoni, Trematoda, Plathelmintha, Helmintha, Invertebrata, Homme, Transmission, Vecteur, Analyse spatiale, Approvisionnement eau, Qualité eau, Kenya, Afrique, Milieu rural
Mots-clés Pascal anglais : Schistosomiasis, Trematode disease, Helminthiasis, Parasitosis, Infection, Schistosoma mansoni, Trematoda, Plathelmintha, Helmintha, Invertebrata, Human, Transmission, Vector, Spatial analysis, Water supply, Water quality, Kenya, Africa, Rural environment
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0245476
Code Inist : 002B05E03C1. Création : 11/06/1997.