The helminth Angiostrongylus costaricensis Morera & Cespedes, 1971 is endemic to the Americas and is responsible for a pathological abdominal syndrome, caused by the presence of the adult helminth in the mesenteric arteries. This is microscopically characterized by eosinophilic infiltration, vascular abnormality and a granulomatous reaction (GraeffTeixeira et al., 1987). The disease was first reported in humans by Cespedes et al. (1967) and Morera (1967) in Costa Rica. The adult worm was subsequently described from specimens recovered during surgical procedures by Morera & Cespedes (1971). The parasite’s current distribution ranges from the southern United States to northern Argentina (Morera, 1988), with human cases having been reported in Costa Rica, Honduras, Colombia, Martinique, Dominican Republic, Puerto Rico, Nicaragua, Mexico, Venezuela, Guadalupe, El Salvador, Panama and Brazil (Kaminsky, 1995).