On top of all this, several other studies published this year suggest that exposure to tuberculosis protects against atopy.

ECONOMIST: Plagued by cures

TB, unlike those against measles, also contribute to protection from atopy is unresolved.

ECONOMIST: Plagued by cures

If you do not know whether your child has atopy, check your family's medical history, since such allergies are often genetic.

CNN: HEALTH

There is also a method that's not widespread called the atopy patch test, which involves wearing a pad containing the possible allergen for about 48 hours.

CNN: Food allergy diagnosis 'an inexact science'

TB, the weaker the response to tests for atopy.

ECONOMIST: Plagued by cures