Heather CallaghanCase reveals possible allergy to this hidden fruit and veggie residue.
A 10-year-old girl has a history of asthma, seasonal allergies and anaphylaxis when exposed to cow's milk or penicillin.
She sat down to eat a blueberry pie, with none of those ingredients.
One bout of anaphylactic shock later, led allergist researchers to dig deeper for the trigger ingredient.
What they found concerns us all, and you'll never find it on a label. And not it's not just pesticides.
