Diarrhetic Shellfish Poisoning, Washington, USA, 2011
Figure 2. . Timeline comparing blooms of Dinophysis spp. dinoflagellates and diarrhetic shellfish poisoning toxin levels detected in mussels collected during 2011 from Sequim Bay State Park, Sequim, Washington, USA. Dinophysis spp. cell counts per liter (black line) were determined by using light microscopy. Total okadaic acid (OA) equivalents (red line), in micrograms per 100 g shellfish tissue, were determined by using liquid chromatography mass spectrometry analysis (14). Dashed line indicates US Food and Drug Administration guidance level of 16 µg total OA equivalents per 100 g shellfish tissue. Dates shown are collection dates for each tested sample.