Has anyone else on here had issues with a sudden onset of a shellfish allergy as an adult? My business partner who is also my neighbor, (therefor we eat together a lot) has developed a shellfish allergy just since Christmas. He ate shrimp and or crab about 4 days in a row over the holidays (mostly my fault from bringing shrimp cocktail to a work party and then sending peope home with homemade gumbo) and then he developed a severe case of hives. Not knowing exactly what caused it he ate some scallops last night and woke up all itchy again this morning (not as bad.) I feel so bad for him, his favorite food is raw oysters!