| molecular characterization of cryptosporidium in brazilian sheep. | feces were collected from 125 sheep between january and december 2007, on ten farms in the state of rio de janeiro, brazil, and examined for the presence of cryptosporidium. ninety samples were collected from lambs 2 to 6 months of age, and 35 were from sheep over 12 months of age. all samples were subjected to molecular analysis by polymerase chain reaction (nested pcr) in two steps of the ssu rrna. two samples (1.6%) from the lambs were positive, and after sequencing were identified as cryptos ... | 2010 | 21075526 |