A competitive enzyme immunoassay (ELISA) was used to determine the presence of okadaic acid (OA) and/or dinophysistoxin-1 (DTX-1) in mussels. The accuracy and sensitivity of the ELISA method has been checked. The sensitivity of the method (100 ng/g of hepatopancreas) makes it possible to determine OA concentrations ten times lower than the tolerance limits established by the Health Authorities of many countries. For the first time, OA and/or DTX-1 were detected in mussels (Mytilus galloprovincialis) collected in different stations along the Adriatic Sea coasts.
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