Abstract
Dexamethasone-immunosuppressed rats infected with Cryptosporidium parvum were used to assess 23 sulfonamides for anticryptosporidial activity. Five of the compounds administered before the animals were inoculated with C. parvum oocysts reduced the severity of cryptosporidial infections in the rat model. Two of the 5 agents with prophylactic activity, sulfadimethoxine and sulfamethazine, were effective also against an established infection, indicating that some sulfonamides may have therapeutic value in immunosuppressed patients with cryptosporidiosis. The findings also suggest that sulfonamide treatment of cryptosporidiosis in the immunocompromised host may not be successful unless the compound is administered continuously or over several weeks.
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