| prevalence of giardia and cryptosporidium and characterization of cryptosporidium spp. isolated from wildlife, human, and agricultural sources in the north saskatchewan river basin in alberta, canada. | the environmental distribution of giardia spp. and cryptosporidium spp. is dependent upon human, agricultural, and wildlife sources. the significance of each source with regard to the presence of parasites in the environment is unknown. this 2-year study examined parasite prevalence in human sewage influent, wildlife, and agricultural sources associated with the north saskatchewan river basin in alberta, canada. fecal samples were collected from cow-calf, dairy, and hog operations in the watersh ... | 2002 | 12166680 |