[search of natural occurrence of xiphidiocercariae (trematoda) in fresh water snails of nine countries from são paulo state, brazil].xiphidiocercariae, aquatic larval stages of some trematodes are considered a potential instrument for biological control of mosquitoes. in this study we evaluated its natural occurrence in campinas region and two places in vale do ribeira (registro and miracatu), são paulo state. snails were obtained from fresh water collections from september 1996 to february 1999. the species collected were lymnaea columella, physa marmorata, biomphalaria tenagophila, biomphalaria sp., drepanotrema cimex, d. l ...200112058671
epidemiology of fasciola hepatica infection in the paraíba river valley, são paulo, brasil.the study revealed that although lymnaea columella and stenophysa marmorata were found in the same habitat, only l. columella harbored intramolluscan stages of f. hepatica. the population density of l. columella cyclically decreased between september and february, and increased from march to september. the drought that occurred between june and november 1981 dramatically reduced the number of snails collected. larger snails were collected in march-july and november-december, while the smaller sn ...19863564331
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