There's a wide spectrum of allergies. You could have somebody with a very minimal reaction to a particular allergen. It's very difficult to come out with a blanket resolution that would cover the whole spectrum of allergies. Instead, the agency looks at it on a case-by-case basis. They look at the level of impairment, what the allergy translates into as an impairment, the situation, and the participation restriction on the individual who's travelling.
On November 4th, 2009. See this statement in context.