Question

define the term allergy?







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Answer 1

Answer:

❥︎An allergen is a usually harmless substance capable of triggering a response that starts in the immune system and results in an allergic reaction. 

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Answer 2

Allergy is the exaggerated response of immune system towards an allergen or antigens present in the environment.

The substance to which such an immune response is produced is called an allergens.

Common examples of allergens are dust, pollens and animal dander etc.