Answer» ____________________
____________________ Definition: The aggravated response of the immune system to CERTAIN antigens present in the environment is called allergy.
____________________ The substances to which such an immune response is PRODUCED are called allergens. The antibodies produced to these are of IgE type. ____________________ Common examples of allergens are mites in dust, pollens, animal dander, etc. Symptoms of ALLERGIC reactions include sneezing, WATERY EYES, running nose and difficulty in breathing ____________________ 
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