[Asymptomatic cryptosporidiosis in an infant].

A two year-old male who presented lack of appetite, mild coughing and one episode of vomiting was assisted in a pediatrics outpatient clinic. The parasitological examination of three stool samples of the patient revealed the presence of Cryptosporidium parvum oocysts. Fecal parasitological examination of his mother and a one year-old sister showed oocysts of the same protozoon in this last patient, who was asymptomatic. With no pharmacological treatment, parasitological stool examination, performed one month later on the two children, resulted negative, being the boy without any symptom.