Filter feeders are the culprits in some of the worst forms of food poisoning. These shellfish draw water in and filter their food from it. In the process, they may ingest poison-producing algae.
Food poisoning from shellfish can be fatal. Brush up on your bivalves and reduce your risk.
Can be affected (filter feeders):
Won't be affected (non-filter feeders):
If you are unsure of where a shellfish has come from, don't eat it. No amount of cooking will make it safe.