An allergen is a substance that can cause an allergic reaction. Allergens are substances that, in some people, the immune system recognizes as "foreign" or "dangerous" but cause no response for most people.
Common allergens include:
See also:
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It's 2009, and that means we are all being forced to switch officially to the HFA type of asthma inhaler. Many other posts here have dealt... Read more »
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Source: ADAM Encyclopedia
An allergy is an exaggerated immune response or reaction to substances that are generally not harmful.See also:Allergic conjunctivitisAllergic... Read more »
Source: ADAM Encyclopedia
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Source: Harvard Decision Guide
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Source: ADAM Encyclopedia
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Source: ADAM Encyclopedia
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Through an illustration learn the best ways to prevent and treat allergies.... Read more »