Predictors of severe anaphylaxis in Hymenoptera venom allergy: The importance of absence of urticaria and angioedema.

Background: Severe anaphylaxis (SA) in Hymenoptera venom allergy has been associated with a number of risk factors. However, the effect of several of those risk factors on the severity of anaphylaxis is poorly defined.

Objective: To evaluate risk factors for SA in Hymenoptera venom allergy.