What happens in immunotherapy?

Tolerance. Immunotherapy is a treatment that involves exposure of the immune system to gradually increasing doses of an allergen to which the person is allergic. During this gradual increase in dose the immune system becomes tolerant or resistant to the exposure reducing the symptoms that a person has on exposure to those allergens in nature.
Tolerance. Specific allergen immunotherapy (allergy shots) causes a switch in the immune system from the allergic state to a less allergic state through the th2/th1 t-cells. This results in less ige allergy antibody being produced in response to allergen exposure.
Change immune state. Immunotherapy can be used to train the immune system to recognize and fight infections or cancer, or to tolerize the immune system to specific allergen.

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