I'm allergic to all shellfish. I became ill overseas this spring when the chef accidentally added shrimp to my meal, after I informed the waitress/kitchen that I wanted the shrimp excluded. Bottom line: don't take any chances.

A medical doctor or naturopath can give you a clear answer. You might try a clinic or college of natural medicine in your area, too. We have such a college in Seattle that tests for allergies and they charge on a sliding fee scale.