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INTRODUCTION AND TERMINOLOGY
The majority of serious sting-related reactions are caused by insects belonging to the order Hymenoptera. Within this order, three families are medically important:
The diagnosis of Hymenoptera allergy (except ants), which is based upon the clinical history and testing for the presence of venom-specific IgE antibodies, will be reviewed here. Accurate diagnosis of venom allergy is important because patients with venom allergy are candidates for venom immunotherapy, a treatment which can dramatically reduce the risk of recurrent severe reactions [1]. The indications and protocols for venom immunotherapy are presented separately. (See "Hymenoptera venom immunotherapy: Efficacy, indications, and mechanism of action" and "Hymenoptera venom immunotherapy: Technical issues, protocols, adverse effects, and monitoring".)
TYPES OF REACTIONS
Most people develop only minor local reactions to Hymenoptera stings. A local reaction is defined as any reaction in which the signs and symptoms are confined to tissues contiguous with the sting site. These reactions are described in detail separately. (See "Bee, yellow jacket, wasp, and other Hymenoptera stings: Reaction types and acute management", section on 'Local reactions'.)
In contrast, systemic reactions cause signs and symptoms throughout the body and include a spectrum of manifestations, ranging from mild to life-threatening. Mild systemic reactions may be limited to the skin and consist of flushing, urticaria, and angioedema. More severe systemic reactions (ie, anaphylaxis) can involve bronchospasm, laryngeal edema, and hypotension. Venom-induced anaphylaxis can be particularly severe and is a leading cause of fatal anaphylaxis. Systemic reactions are described in detail elsewhere. (See "Bee, yellow jacket, wasp, and other Hymenoptera stings: Reaction types and acute management", section on 'Systemic allergic reactions/anaphylaxis' and "Fatal anaphylaxis".)
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