敏射击

概述

Allergies are inappropriate or exaggerated reactions of the immune system to substances that, in the majority of people, cause no symptoms. Symptoms of the allergic diseases may be caused by exposure of the skin to a chemical, of the respiratory system to particles of dust or pollen (or other substances), or of the stomach and intestines to a particular food." rel="tooltip">过敏注射是最常用和最有效的过敏形式Immunotherapy ("allergy shots") is a form of preventive and anti-inflammatory treatment of allergy to substances such as pollens, house dust mites, fungi, and stinging insect venom. Immunotherapy involves giving gradually increasing doses of the substance, or allergen, to which the person is allergic. The incremental increases of the allergen cause the immune system to become less sensitive to the substance, perhaps by causing production of a particular "blocking" antibody, which reduces the symptoms of allergy when the substance is encountered in the future." rel="tooltip">免疫疗法. 它们适用于治疗影响鼻子和眼睛（过敏性鼻结膜炎）、耳朵（过敏性中耳炎）、肺（支气管）的过敏性疾病Asthma is a chronic, inflammatory lung disease characterized by recurrent breathing problems. People with asthma have acute episodes where the air passages in their lungs get narrower, and breathing becomes more difficult. Sometimes episodes of asthma are triggered by allergens, although infection, exercise, cold air and other factors are also important triggers." rel="tooltip">哮喘)以及严重的昆虫叮咬过敏。注射可有效治疗对许多过敏原的反应，包括树,草,杂草,模具,室内灰尘,动物皮屑，及虫刺.

少量过敏原的提取物被注射到手臂的皮肤中。每周注射一次（有时更频繁），持续约七个月，之后每两周注射一次。最后，可以每四周注射一次。治疗的持续时间可能是三到五年，有时更长。