Symptom Percent Acute Symptoms and Signs Dizziness 80 Nausea and vomiting 76 Abdominal cramps 51 Severe headache 43 Diarrhea 42 Palpitations 35 Agitation <25 Chronic Amnesia (short-term memory loss) 25 Diplopia 15 Confusion, disorientation and coma <5

Table 1: Acute symptoms of Amnesic Shellfish Poisoning in 99 patients, after consuming mussels contaminated with domoic acid [Perl et al. 1990].