In extreme cases breathing may be arrested. The active agent in ASP is domoic acid. Onset of symptoms include severe nausea, vomiting and diarrhea. ASP also acts on the nervous system. Since 1996 less than 20 reported cases of marine biotoxin poisoning have occurred in BC coastal communities.
Many more cases go unreported as symptoms can be mild and often non-lethal.
In 1997, victims of PSP who chose to ignore warnings and closures were air-evacuated from Pender Island. Some believe that bivalve consumption is safe during months with an R. Not true for the Pacific coast where conditions optimal for algal growth can occur throughout winter. Another misconception is that heat from cooking denatures the toxin. Anyone suspecting that they have consumed contaminated bivalves should seek medical attention immediately. Information is readily available on the status of marine biotoxin closures.