Monoclonal antibodies (MAb) were prepared against the 40-kDa capsid protein of Cryptosporidium parvum virus (CPV) by immunizing mice with purified recombinant CPV40 protein. In immunoblotting analysis, MAbCPV40-1 bound to a 40-kDa protein in extracts of C. parvum oocysts. This 40-kDa protein was localized in the sporozoite cytoplasm by immunofluorescence (IFA) staining with MAbCPV40-1. In a dot-blot assay, MAbCPV40-1 was capable of detecting 102 non–bleach-treated and 102–103 bleach-treated C. parvum oocysts. MAbCPV40-1 was capable of detecting CPV40 antigen in both soluble and total C. parvum oocyst protein extracts, indicating a potential use for detecting this parasite in environmental samples.
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