Study Using Xolair in Rush Multi Oral Immunotherapy in Multi Food Allergic Patients

We will enroll multi food allergic participants (4-55 years of age) with proven "multi food allergies". We anticipate enrolling 60 participants with allergies to, at least two foods. Participants must have food specific IgE\>4kU/L for each allergen or a skin test reactivity to each food allergen ≥ 6 mm wheal diameter. We have chosen criteria associated with a very low likelihood of natural loss of food allergy for the duration of this protocol. These values of specific IgE and SPT were chosen based on the opinions of 4 experts. Participants also must have a total IgE \<1500kU/L, a clinical reaction during a double blind placebo controlled food challenge (DBPCFC) with food proteins/powders to establish sensitivity to given food proteins/powders (milk, egg, peanut, almond, wheat, cashew, sesame seed, soy, walnut, hazelnut) and no clinical reaction during placebo (oat) as per CMC section of IND. Participants will undergo a rush desensitization day at week 8 to a maximum dose of 1,250 mg total protein. Participants will be ingesting either 2 to 5 food allergens, depending on their allergy screening. They will consume home doses for two weeks based on the these results and document reactions. Upon returning to the CFRU (Clinical Food Research Unit) two weeks later, a dose escalation will be attempted. This cycle will continue until the participant reaches a maximum dose of 2,000 mg protein daily of each food allergen (two to five food allergens to be ingested by the participant). No more than 5 allergens will be given.