| [intestinal schistosomiasis from schistosoma mansoni in madagascar: extent and center of the endemic]. | schistosoma mansoni and s. haematobium affect respectively 2 million and 500,000 persons in madagascar. over the past decade, s. mansoni has spread in the central highlands of madagascar, essentially throughout the mid-west and antananarivo plain. to understand this recent change in the epidemiology of s. mansoni, we examined the relationship between its spatial distribution and several host factors, including labour migration, urbanization and water development projects. in the highlands, the d ... | 1999 | 10399598 |
| microsatellite variation in the freshwater snail biomphalaria pfeifferi. | | 2000 | 10886669 |
| the influence of mating system, demography, parasites and colonization on the population structure of biomphalaria pfeifferi in madagascar. | current evolutionary forces and historical processes interact to shape the distribution of neutral genetic variability within and among populations. focusing on the genetics of recently introduced organisms offers a good opportunity to understand the relative importance of these factors. this study concerns variation at 8 polymorphic microsatellite loci in 30 populations of biomphalaria pfeifferi. the sampling area spans most of the species' range in madagascar where it was probably introduced r ... | 2002 | 12406234 |
| ecological studies in madagascar of biomphalaria pfeifferi, intermediate host of schistosoma mansoni. 2. biology and dynamics in the non-endemic area of antananarivo. | the region of antananarivo, where schistosomiasis is not yet endemic, is compared to ambositra, a well established focus of s. mansoni, with regard to climate, hydrology and snail habitats. higher mean temperatures and a more pronounced dry season in antananarivo contribute to sometimes less favourable hydrological conditions. biomphalaria is found in very few and limited habitats. population dynamics were followed up in selected habitats and showed ecological parameters comparable to those of t ... | 1978 | 747438 |