The purpose of this study is to determine safety of allergy immunotherapy lymph node injections for grass pollen allergies.

Specific immunotherapy (SIT) has been used in the treatment of allergic disease for over one hundred years. SIT for environmental allergies consists of allergen extracts that have been traditionally administered by subcutaneous or sublingual routes to both children and adults. In the United States, subcutaneous immunotherapy (SCIT) is currently the only FDA-approved route of administration for allergenic extracts. In recent years, a novel method of administering allergen immunotherapy, intralymphatic immunotherapy (ILIT), has been developed, which has shown to be safer, more efficacious, and less painful than traditional SCIT. ILIT can dramatically decrease treatment time from 3 - 5 years to 8 weeks. It has only been studied in European adults. The aim of this project is to study efficacy and safety of intralymphatic immunotherapy in adolescents and young adults with allergic rhinoconjunctivitis, using currently available allergen extracts. Patients with clinical history suspicious for rhinitis with or without conjunctivitis, correlating with positive allergy skin and/or blood tests to grass pollen, will be randomized to either placebo (normal saline) or treatment (Center-Al grass pollen extract) arms. A total of 3 injections over eight weeks will be administered intralymphatically. A third arm will include an observational group of grass-allergic subjects already receiving SCIT for 1 year. Primary outcome will be comparison of a safety score between arms 1 and 2. We will follow adverse events, as well as serum markers for Th2 and Th1 phenotypes, and objective respiratory measures (spirometry and FeNO) in those with asthma. Visits will occur at baseline for screening/enrollment, on day 0/week4/week 8 for injections (injection visit for arms 1 and 2 only), and for follow-up at 12 weeks and near end of grass pollen season. A substudy will evaluate participants one-year after completing ILIT injections by obtaining repeat serum biomarker levels and interval change in medical history. Results could help in dramatically decreasing treatment time, as well as increasing safety of allergen immunotherapy.

Inclusion Criteria:

• Age 15-24 years
• Bothersome nasal, ocular, and/or respiratory symptoms correlating with grass pollen season (summer)
• Grass pollen allergic (+ skin prick test [wheal ≥ 3 mm larger than negative control] or specific IgE [minimum 0.35 kU/L] to grass pollen [Timothy or a northern pasture grass mix containing Timothy])
• Informed consent obtained and signed
• Informed assent (as appropriate) obtained and signed
• Understanding of study procedures
• Ability to comply with study procedures for the entire length of the study
• For inclusion in observational group (arm 3), must have initiated SCIT containing grass pollen 12 - 18 months prior to grass pollen season 2014 (ex. started SCIT any time Dec 2012 - May 2013). This group was included for comparison between traditional IT and ILIT, and these subjects will continue SCIT during this study. Since patients undergoing SCIT may not see clinical response to therapy until 12 months, we selected this time point to better compare with the more rapid immunologic and clinical changes expected with ILIT.

Exclusion Criteria:

• Significant year-round allergy symptoms and year-round symptoms without worsening during grass pollen season (summer). (Exception: intermittent year-round symptoms with significant worsening during summer is acceptable for inclusion).
• Blood donation or surgery within the previous 30 days of baseline/enrollment, visit #1.
• Use of investigational drugs within the previous 90 days
• Pregnancy or nursing
• Mastocytosis
• Significant cardiovascular, hepatic, renal, autoimmune, hematological, or active infectious disease
• History of malignancy, hypertension, use of immunosuppressive agents, beta-blockers, ACE inhibitors, or tricyclic antidepressants
• Pulmonary disease, including moderate to severe, perennial asthma (FEV1 < 80% predicted) and perennial use of inhaled corticosteroids (exception: seasonal allergic asthma will not be excluded)
• Previous IT (exception: those in observational arm currently on grass SCIT).
• No readily accessible inguinal lymph nodes