| [susceptibility of biomphalaria glabrata to schistosoma mansoni from venezuela and brazil]. | schistosoma mansoni partially develops its life cycle into snails of the family planorbid. biomphalaria glabrata represents an important host-intermediate. this paper reports experimental infection with miracidia vs. snail in sympatric and parapatric combination. the infection assay to sympatric combination were: bh snail (belo horizonte, brasil) vs. a common geographic origin parasite, and barbula, carabobo state, venezuela vs. sm venezuela parasitic. the parapatric combination were: bh snail v ... | 1999 | 10932760 |
| interspecific competition between freshwater snails of medical importance: a venezuelan example. | lake valencia is located in the centre of the endemic area of the intestinal schistosimiasis in venezuela. the dominance of two pulmonate species, biomphalaria glabrata and b. prona., was observed in the lake. both species are strongly associated with two distinct types of habitats suggesting that competition is occurring between these two species. b. glabrata and b. prona play the role of intermediate hosts of schistosomes in venezuela. at the present time, parasite transmission is not occurrin ... | 2001 | 11280046 |
| genetic differentiation, dispersal and mating system in the schistosome-transmitting freshwater snail biomphalaria glabrata. | biomphalaria glabrata is the main intermediate host of schistosoma mansoni in america and one of the most intensely studied species of freshwater snail, yet very little is known about its population biology. here, we used seven highly polymorphic microsatellite loci to analyse genetic diversity in populations from three regions (lesser antilles, venezuela and southern brazil). considerable genetic variation was detected, with an average (s.d.) h(0) = 0.32 (0.24). more diversity per population wa ... | 2002 | 12242641 |
| [compatibility between nine strains of biomphalaria glabrata coming from endemic and non-endemic areas and one strain of schistosoma mansoni from venezuela]. | nine lots of 32 b. glabrata snails (5-7mm in diameter) from the following strains from the endemic area: cagua, valencia lake (puerta negra sector), ingenio bolívar (aragua state), mariara, caserío el 25 and güigüe (carabobo state), and from the non-endemic area: anzoátegui (lara state), chabasquén (portuguesa state) and caripe (monagas state) were experimentally infected (5 miracidiums/snail) with c5 schistosoma mansoni strain. the intramolluscal prepatent period oscillated between 23 and 25 da ... | 1999 | 10881105 |
| [host parasite relationship among 3 schistosoma mansoni and 6 biomphalaria glabrata strains from epidemic and no epidemic venezuelan areas is studied]. | six lots of 18 b. glabrata from: la victoria, turmero, cagua in aragua state; caserío el 25 in carabobo state, chabasquén in portuguesa state and humocaro bajo in lara state, were experimentally infected with miracidia of sm, c5 and c6 strains of schistosoma mansoni (18 snails/schistosoma mansoni strain). the averages of the intramolluscal period (imp) obtained for the s. mansoni strains were very similar and comprised between 35.4 and 36.1 days. no significative statistical differences in the i ... | 2000 | 11338975 |
| fine-scale population structure and dispersal in biomphalaria glabrata, the intermediate snail host of schistosoma mansoni, in venezuela. | biomphalaria glabrata is the main intermediate host of schistosoma mansoni in america and one of the most intensely studied species of freshwater snails, yet very little is known about its population biology. here, we used seven highly polymorphic microsatellite loci to analyse genetic diversity in the valencia lake basin, which represents the core of the endemic area for schistosomiasis in venezuela. populations were sampled at short spatial scale (a few kilometres), both inside the lake and in ... | 2002 | 11975704 |