A case-control study was conducted in the urban area of Attica, Greece to investigate risk factors for sporadic Campylobacter jejuni infections in children aged <15 years. Over a 2-year period, 205 cases and 205 controls, matched by age group (<1, 1-4, 5-9, 10-14 years) and gender, were selected from the registries of the paediatric hospitals of this area. In conditional multivariate logistic regression analysis, ethnicity [odds ratio (OR) 5·06, 95% confidence interval (CI) 2·49-10·28], consumption of chicken the week prior to disease onset (OR 1·97, 95% CI 1·10-3·55) and playing in the garden (OR 1·83, 95% CI 1·05-3·19) were independently associated with disease occurrence; consumption of raw vegetables was a 'protective' factor (OR 0·48, 95% CI 0·27-0·85).