No association between abdominal pain and in Dutch and Belgian children.

Objective: To study the association between colonisation and faecal calprotectin to see whether the parasite is a harmless commensal or a gut pathogen.

Design: Cross-sectional study of previously collected stool samples.

Setting And Patients: Two hundred stool samples originated from children aged 5-19 years with chronic abdominal pain and diarrhoea, who were seen in paediatric clinics in the Netherlands and Belgium and in whom somatic gastrointestinal disorders were excluded.