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Diarrhetic Shellfish Poisoning

Confirmed Case

  • Clinical illness [1] within 12 hours of consuming at risk shellfish [2];
  • Laboratory confirmation through:
    • Detection of lipophilic shellfish toxins (sum of okadaic acid and dinophysis toxins (DTX-1, DTX-2 and DTX-3)) in ingested at risk shellfish
      • In digestive tissues in excess of 1 mg/kg (1 ppm);
      • In edible tissues in excess of 0.16 mg/kg (0.16 ppm).
    • Detection of high levels of dinoflagellates (Dinophysis spp. and Prorocentrum spp.) associated with shellfish poisoning in water from which epidemiologically-linked at risk shellfish [2] were harvested.

Probable Case

  • Clinical illness [1] within 12 hours of consuming at risk shellfish [2].


  1. Clinical illness defined as: acute gastrointestinal symptoms (nausea, vomiting, abdominal discomfort and/or diarrhea) with possible headache or chills. Illness can last up to 3 days.
  2. At risk shellfish include filter feeding molluscan bivalve shellfish: clams, mussels, scallops (only in midgut gland or hepatopancreas), oysters, cockles, and whelks and the hepatopancreas of crab.
SOURCE: Diarrhetic Shellfish Poisoning ( )
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