Recognizing invader
From DrKoop's partner site on allergy, MyAllergyNetwork.com
An allergy occurs when the immune system reacts to substances (allergens) that are generally harmless and in most people do not cause an immune response. Antibodies are formed by the immune system in response to the presence of an antigen such as pollen, mold, dust or dander.
Review Date: 10/30/2006  advertisement
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