A. cantonensis is found in south-east Asia, the Pacific and Australia, including Polynesia, Indonesia and Papua New Guinea (Hung and
Chen, 1988). Because of its lack of host specificity and the mobility of rats, A. cantonensis has become established throughout much of the tropical and sub-tropical parts of the world. Infection is transmitted to humans and is acquired by eating raw molluscs or raw food that has been contaminated by them.
A. costaricensis is found throughout Central and South America and is enzootic in Texas, although no human diseases have been detected (Hulbert et al., 1992). A case-control study showed that the risk of abdominal angiostrongy-liasis was related to ingestion of raw food items such as mint, shrimp and ceviche that contain mint (Kramer et al., 1998). The slug that is the intermediate host of this pathogen is not considered to be good to eat, and this suggests that contaminated food is the main vehicle of infection (Bonetti and Graeff-Teixeira, 1998).
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