Changes

* Antigens that induce a type I reaction are known as allergens.

* Antigens that induce a type I reaction are known as allergens.

* Generally affects face, eyes, nose and feet

* Generally affects face, eyes, nose and feet

* [[Immunoglobulin E - WikiBlood|IgE]] has a high affinity to IgE receptors on mast cells and basophils, and so binds these receptors.

* [[Immunoglobulin E - WikiBlood|IgE]] has a high affinity to IgE receptors on [[Mast Cells - WikiBlood|mast cells]] and [[Basophils - WikiBlood|basophils]], and so binds these receptors.

==Common allergens which elict a type I hypersensitivity reaction:==

==Common allergens which elict a type I hypersensitivity reaction:==