Chapter 4: Stinging insect allergy and venom immunotherapy
The Hymenoptera order is divided into three families: Apids, Vespidae, and Formicidae. Apids include the honeybee, bumblebee, and sweat bee, which are all docile and tend to sting mostly on provocation. The Africanized killer bee, a product of interbreeding between the domestic and African honeybee, is very aggressive and is found mostly in Mexico, Central America, Arizona, and California. The yellow jacket, yellow hornet, white (bald)-faced hornet, and paper wasp all belong to the Vespidae family. The Formicidae family includes the harvester ant and the fire ant. When a “bee” sting results in a large local reaction, defined as >5 in. and lasting >24 hours, the likelihood of anaphylaxis from a future sting is ∼5%. For comparison, when there is a history of anaphylaxis from a previous Hymenoptera sting and the patient has positive skin tests to venom, at least 60% of adults and 20‐32% of children will develop anaphylaxis with a future sting. Both patient groups should be instructed about avoidance measures and carrying and knowing when to self-inject epinephrine, but immunotherapy (IT) with Hymenoptera venom is indicated for those patients with a history of anaphylaxis from the index sting and not for patients who have experienced a large local reaction. IT is highly effective in that by 4 years of injections, the incidence of subsequent sting-induced anaphylactic reactions is 3%. This incidence may increase modestly after discontinuation of injections but has not been reported >10% in follow-up.
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Document Type: Research Article
Publication date: 01 May 2012
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