 The objective of this study is to determine whether there is a relationship between interferon-gamma levels and the incidence of viral respiratory infections in allergic children treated with allergy immunotherapy as compared to those treated with standard medical care nasal steroids, antihistamines over a 1-year period. The hypotheses to be tested are 1 interferon-gamma levels will be significantly increased 3, 6, 9 and 12 months in allergic children treated with allergy immunotherapy as compared to those treated with standard medical care, 2 the incidence of viral respiratory infections will be reduced at 3, 6, 9 and 12 months in allergic children treated with allergy immunotherapy as compared to those treated with standard medical care. 