A member asked:

Why are some allergies moree common than others (like cats)?

A doctor has provided 1 answer
Dr. James Fox answered

Exposure/foreignness: The frequency of an allergy is related to the amount of exposure that a population has and how likely a protein is to promote production of the allergic antibody. Proteins that are much different than those made by humans are more likely to cause this type of reaction.

Answered 10/4/2016

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