585 Chronic Idiopathic Urticaria and Neglected Toxocara Infection.

Background The diagnosis of chronic idiopathic urticaria is stated when all possible causes of urticaria are excluded. Toxocariasis is a parasitic infection induced by a nematode belonging to the family of Ascaridae with generally affects cats and dogs. Human infestation is caused by the accidental ingestion of embryonated eggs of Toxocara; the larvae do not develop into adult worms but may migrate to several organs, giving rise to a number of clinical expressions, including chronic urticaria.