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  • Title: Antigens of Cryptosporidium sporozoites recognized by immune sera of infected animals and humans.
    Author: Mead JR, Arrowood MJ, Sterling CR.
    Journal: J Parasitol; 1988 Feb; 74(1):135-43. PubMed ID: 3282049.
    Abstract:
    The humoral response of humans, calves, and horses to Cryptosporidium sporozoite antigens was evaluated using a western blot technique. Sera from calves, humans, and horses were obtained at various times following the detection of infection. Sera were reacted with detergent-solubilized, sodium dodecyl sulfate polyacrylamide gel-electrophoresed (SDS-PAGE) sporozoite antigens. The number of antigens recognized by immune sera from humans and animals increased with time postinfection. A 20-kDa antigen appears to be a major sporozoite surface determinant labeled via membrane protein biotinylation and recognized by mouse monoclonal antibodies using indirect immunofluorescence and western blotting. Detectable recognition of the 20-kDa band occurred in 3-wk postinfection (PI) sera from all species tested. Reactivity to the 20-kDa band diminished significantly in sera 5 mo PI or longer from infected humans with no known recurrence of cryptosporidial diarrhea. In contrast, 12-mo PI sera from an individual constantly exposed to oocysts under working conditions was as strongly reactive as the 3-wk convalescent sera. Serum reactivity to the 20-kDa antigen appears to be a good indicator of exposure to Cryptosporidium.
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