Pharmacosurveillance Data Repository of Patients With and Without History of Anaphylactic Reactions Subsequent to Xolair Dosing

You may be eligible if

• Confirmed anaphylaxis based on Sampson criteria subsequent to Xolair
• At least 1 patient control among 4 controls who discontinued Xolair for at least 16 weeks but not more than 18 months at enrollment
• At least one dose of Xolair in the 18 months before the date of the case event (index date)
• No prior anaphylaxis or other hypersensitivity reaction subsequent to Xolair dosing, including any reactions to its components