Parasitic Diseases, Nematodes (Roundworms)

Animals Involved

Marine mammals (cetaceans and pinnipeds) and fish­ eating birds are definitive hosts; fish, crustaceans, and cephalopod mollusks are intermediate or paratenic hosts

Known Distributions

Worldwide but many cases in northern Asia and western Europe

Probable Means of Spreading

Ingestion of undercooked marine fish, squid, octopus

Clinical Manifestations in People

Gastroenteritis with upper quadrant pain; parasite usually in stomach; small­intestinal infections unusual but can occur; colon, esophagus rarely involved; oropharyngeal worm can cause hematemesis, cough; urticaria and other allergic signs after ingestion of live or dead worms

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