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- Nematode (roundworm) parasites causing 2 distinct syndromes:
- A. cantonensis (rat lungworm): perhaps the most common cause of eosinophilic meningitis.
- A. costaricensis: cause of eosinophilic gastroenteritis (abdominal angiostrongylus).
- Rats are definitive hosts; mollusks (snails and slugs) are intermediate hosts.