[Allergy to Anisakis simplex].

Anisakis simplex is a nematode which infects marine fish. It requires marine mammals for its development. The larvae are found in fishes, crustaceans and cephalopods which are intermediate hosts. The parasite can be ingested by man -mainly with raw fishes- and induces an infestation called anisakiasis or anisakidosis with digestive tract symptoms. Since 1990, we have known that the parasite can also induce allergic symptoms such urticaria.