The term allergy, often used interchangeably with hypersensitivity, refers to particular types of abnormal immune responses to antigens, which are called allergens in these cases. There are two major forms of allergy: (1) immediate hypersensitivity, which is due to an abnormal B lymphocyte response to an allergen that produces symptoms within seconds or minutes, and (2) delayed hy-persensitivity, which is an abnormal T cell response that produces symptoms between 24 and 72 hours after exposure to an allergen. These two types of hypersensitivity are compared in table 15.11.
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The human body And Todays chemical infested world. Here is a news flash You are not allergic to pollen, pet dander, or whatever it is that makes your body revolt Rather, your body just can not handle that one thing, what ever it is, anymore, due to the massive barrage of toxic chemicals you and everyone else are ingesting every single day.