Disseminated infection in an infant with CD40L deficiency.

The protozoan affects the digestive tract of humans and animals. Cryptosporidiosis leads to diarrhoea mimicking a cholera-like course with dehydration and may even result in death in immunodeficient patients, as patients with hyper-IgM syndrome. We describe a rare case of disseminated infection in a seven- year-old boy with CD40 L deficiency.