Cryptosporidiosis is a frequent cause of Traveler's diarrhea in children. In its acute or chronic form, this diarrhea is often accompanied by dehydration and accompanying deterioration in health. Diagnosis may be reached by inspection of the stools, for parasites, utilising specific but simple procedures. The latter tests should be carried out by the laboratory in addition to the routine parasitological examination. Prognosis is good in immunocompetent children since the clinical signs spontaneously regress within about a month. The only treatment consists in symptomatic treatment of diarrhea. Spiramycin, though not constantly effective, is reserved for immunosuppressed patients.