PATHOLOGY

Detailed explanation-1: -The anaphylactic response is mediated by IgE antibodies that are produced by the immune system in response to environmental proteins (allergens) such as pollens, animal danders, or dust mites.

Detailed explanation-2: -An allergy occurs when the body’s immune system becomes hyperreactive to a substance that could be harmless in itself, called an allergen. The external substances that provoke allergies are called allergens.

Detailed explanation-3: -Allergies. The immune reaction that results from immediate hypersensitivities in which an antibody-mediated immune response occurs within minutes of exposure to a usually harmless antigen is called an allergy.

Detailed explanation-4: -If you are born with certain genes, your immune system may react to substances in the environment that are normally harmless. These substances are called allergens. Having an allergic reaction is the most common example of an overactive immune system. Dust, mold, pollen, and foods are examples of allergens.

Detailed explanation-5: -Type I: reaction mediated by IgE antibodies. Type II: cytotoxic reaction mediated by IgG or IgM antibodies. Type III: reaction mediated by immune complexes. Type IV: delayed reaction mediated by cellular response.