Allergies are a very common problem, affecting at least two out of every 10 Americans.
What Is an Allergy?
Allergies
are an abnormal response of the immune system. People who have
allergies have an immune system that reacts to a usually harmless
substance in the environment. This substance (pollen, mold, and animal
dander, for example) is called an allergen.
Allergies are a very common problem, affecting at least two out of every 10 Americans.
Allergies are a very common problem, affecting at least two out of every 10 Americans.
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