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Shellfish are fairly resistant to it, but some are susceptible.
Eating 3 of the infected mussels would be enough to kill a person. The Department of Marine and Coastal Management tested the mussels and say they had died from paralytic shellfish poisoning, which is the most toxic form of red tide. The department will test black and white mussels on the West Coast and warned the public not to eat mussels found north of Cape Point. Infected shellfish remain toxic a month after their death.