That level of sensitivity exists with almost any allergy - I had a friend who ate french fries that had been cooked in the same oil as a deviled crab – her entire face swelled up because of the cross-contamination.
A former colleague’s wife is so sensitive to yeast and gluten that she had an allergic reaction when her husband kissed her after having a beer at an after-work happy hour.
Serious allergies are really scary stuf.
