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A previously healthy, white 8-year-old girl presented with a 1-week history of abdominal pain and vomiting after a trip to a lake in Pennsylvania, north-eastern USA. There was marked dehydration. A raised blood eosinophilic count prompted microscopy for ova and parasites which demonstrated a heavy load of larvae of Strongyloides stercoralis. Charcot–Leyden crystals were also detected. The child received oral ivermectin and made a complete recovery.