36 subjects will receive Xolair, and 8 subjects will receive placebo. The study will occur at 4 sites: Boston Children's Hospital, Children's Hospital of Philadelphia, Stanford University and Lurie Children's Hospital.
Patients will be pre-treated with Xolair or placebo before rapid oral peanut desensitization. Patients will continue to receive Xolair during the 8 subsequent weeks of desensitization, receiving their final dose of Xolair one week after reaching the highest tolerated dose of peanut.
