A 5-year-old boy was admitted with a 12-h history of fever up to 40 C and anorexia. The physical examination was unremarkable, while laboratory investigation revealed elevated white blood cell count (WBC):17.7 × 10 9 /mL (neutrophils: 79%, lymphocytes: 14%, monocytes: 7%) and C-reactive protein (CRP: 36.6 mg/L). Blood and urine cultures were negative.The boy belonged to the ethnic minority of Roma, lived in a semi-rural area under conditions of poverty and poor sanitation and had contact with cats and dogs. Past medical history revealed persistent eosinophilia for the past 6 months (absolute eosinophil count up to 2.6 × 10 9 /mL). Therefore, he had been prescribed oral mebendazole (two doses within a two-week interval) for presumed pinworm infection twice, 3 and 1 months prior to admission, despite the absence of clinical and laboratory evidence. On the second day of hospitalisation, he complained of generalised deteriorating abdominal pain and distention and presented non-bloody diarrhoea. Laboratory investigation showed WBC: 10.5 × 10 9 /mL (neutrophils: 46%,