即发性过敏反应 Type I hypersensitivity
（重定向自Respiratory hypersensitivity）
即发性过敏反应主要可分为两种：全身性过敏反应（generalized anaphylaxis），主要引起的原因有被昆虫（蜜蜂、蚂蚁）叮咬和食物过敏。严重时可能会支气管全面收缩、休克死亡。异位性过敏反应（atopic allergy），主要引起原因为接触或吸入过敏原（花粉）。常见的症状有气喘、湿疹、过敏性鼻炎。
Respiratory hypersensitivity
中文百科
英语百科
Type I hypersensitivity 即发性过敏反应
（重定向自Respiratory hypersensitivity）
Type I hypersensitivity (or immediate hypersensitivity) is an allergic reaction provoked by reexposure to a specific type of antigen referred to as an allergen. Type I is not to be confused with Type II, Type III, or Type IV hypersensitivities.
Exposure may be by ingestion, inhalation, injection, or direct contact.
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