Want to hear something funny...years ago growing up I ate shrimp and shelled fish and at times I noticed it would leave me not ill but kind of funny feeling and kind of tingly until about the age 28 or so...the wife brought home a pound of cold shrimp cocktail from the grocery store in which I gobbled it all....about 20 minutes later I started really itching all over, like really itching, balls and all not to mention I was really having trouble breathing and rashing out ...off to the hospital I went...have not ate shelled fish now for over 30 years...LOL