HYPERSENSITIVITY REACTION

WordNet Dictionary

	Definition:	[n] an inappropriate and excessive reaction to an allergen (as pollen or dust or animal hair or certain foods); severity ranges from mild allergy to severe systemic reactions leading to anaphylactic shock

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	See Also:	allergic reaction, allergic rhinitis, allergy, anaphylaxis, hives, hypersensitivity, nettle rash, urticaria, urtication