I fed my son scrambled eggs and he had a severe reaction (hysterical, formula pooled in his mouth so we're assuming his throat swelled up and he couldn't swallow, went white as a ghost, hives from head to toe). It was pretty obvious. That was last January and he was officially diagnosed by a scratch test in June. We don't know if he has a nut allergy or not. They wouldn't test him because of false positives, so we can't feed him any nuts until he's at least 2.