Severe, Protracted Intestinal Cryptosporidiosis Associated with Interferon Deficiency: Pediatric Case Report

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Abstract
We describe a human immunodeficiency virus-negative infant with chronic intractable diarrhea due to Cryptosporidium parvum; he had a history of significant weight loss since the second week of life. A preliminary study of his immune function was negative for primary immunodeficiency. To further study his immune function, proliferation of peripheral blood mononuclear cells(PBMCs) was elicited by crude antigenic extract from C. parvum oocysts (CCE). Supernatants of CCE-stimulated PBMCs contained interleukin 10 but not interferon γ (IFN-γ), while PBMCs from a control (a 2-year-old immunocompetentinfant who had recovered from cryptosporidiosis) showed a strong response to IFN-γ when stimulated with CCE. These results stress the role of IFN-γ in recovery from cryptosporidiosis.

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