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Desensitization Caused by Allergies
Desensitization also called Hyposensitization , treatment that attempts to eliminate allergic reactions , as of hay fever or bronchial asthma , by a series of injections in graded strengths of the substance to which the person is sensitive.
The first injections contain little antigen , but , as desensitization progresses , more and more is added .
A three-month program of injections often suffices for hay-fever sufferers , but asthmatics may require a longer program .
Desensitization is successful in about 80 percent of hay-fever sufferers and up to 90 percent of asthmatics ; treatment is more effective in persons with a few , well- defined allergies than in those allergic to many substances .
The success of desensitization is attributed to special antibodies , called blocking antibodies , that appear in the serum after treatment and combine preferentially with allergen .
This prevents the reaction of allergen with allergic antibodies in the skin and precludes an allergic reaction .
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