Multi OIT to Test Immune Markers After Minimum Maintenance Dose

All subjects will receive omalizumab, stored and prepared according to the investigator brochure. Subjects greater or equal to 4 yrs receive 150 mg. Subjects less than 4 yrs receive 75 mg.

The subject's allergens will be introduced after receiving the third omalizumab dose.. Subjects will return to clinic to escalate the dose of their allergens until 300 mg (group A) vs. 1200 mg (group B) total protein daily dose is reached. There will be equivalent allergen protein portions depending on test allergen per each subject's history. Subjects will be randomized 1:1 to either group A or group B after meeting eligibility criteria. All subjects and study personnel will be blinded to group A vs B. Research staff will administer food flour to the subject orally in an age-appropriate food vehicle.