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[Seafood poisonings. Part I. Shellfish and crustacean poisonings].

Seafood is a valuable source of nutrients, therefore, it constitutes an important part of diet in some geographical regions. The consumption of some shellfish and crustacean species may be a cause of food poisonings in humans, mainly due to simultaneous ingestion of biotoxins produced by algae, cyanobacteria, and bacteria. These toxins are accumulated in higher links of a food chain, i.e. mollusks and crustaceans, that consume toxins filtering phytoplankton. In the present paper the etiology, pathogenesis, symptomatology and treatment of some shellfish poisonings are presented.