[Swine cryptosporidiosis related to production systems in the state of Rio de Janeiro].

The purpose of this study was to verify the prevalence of cryptosporidiosis in swine farms of familiar and technical production systems, located in the North and Northwest Regions of the State of Rio de Janeiro. A total of 103 fecal samples of different swines were collected, proceeding from 10 farms, of which five were familiar and five technical. For the diagnosis, the modified concentration by sedimentation technique with posterior staining by modified Ziehl-Neelsen was used. Forty and 29.3% of prevalence were observed in the familiar and technical farms respectively, and they were not statistically different. The parasitism occurs in both production systems, probably due to an absence of previous diagnosis of the illness. After morfometric and morphological analysis and statistical study of correlation of the 87 oocysts found, it was suggested that exists more than one species of Cryptosporidium spread in the properties, and they are common to each of the production systems. This hypothesis needs to be confirmed through studies of molecular biology, to characterize the species.