Hypersensitivity is an abnormal and harmful reaction, towards an antigen. It includes alloimmunity (reaction to transplanted tissues from another person), autoimmunity (reaction to one’s own tissues), and allergies. Allergies react to an antigen, which is from the environments. Such environmental antigens are known as allergens that occur in pollen, dust, mold, vaccines, wasp venom, bee, animal dander, poison ivy, and foods such as milk, nuts, egg, shellfish, and some plants.

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Chapter 21.6, Problem 29BYGO

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Hypersensitivity is an abnormal and harmful reaction, towards an antigen. It includes alloimmunity (reaction to transplanted tissues from another person), autoimmunity (reaction to one’s own tissues), and allergies. Allergies react to an antigen, which is from the environments. Such environmental antigens are known as allergens that occur in pollen, dust, mold, vaccines, wasp venom, bee, animal dander, poison ivy, and foods such as milk, nuts, egg, shellfish, and some plants.

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