• Allergic sensitization in children at high risk of asthma and atopy [ Time Frame: 3 years ] [ Designated as safety issue: No ]
  

• Incidence of asthma in children at high risk for developing asthma and atopy [ Time Frame: 3 years ] [ Designated as safety issue: No ]
  
• effects of OMIP on the immune response to allergens [ Time Frame: 3 years ] [ Designated as safety issue: No ]
  

Researchers suspect that allergies to common inhaled allergens (such as house dust mite, cat dander, and grass pollens) are a major cause of childhood asthma. Recent evidence suggests that if allergies to inhaled allergens are prevented, this can cause changes in the immune system that may inhibit the development of asthma. Although strategies to prevent allergies generally focus on avoiding the allergen, complete avoidance of the common allergens linked to asthma would require extreme measures and is impractical.

Oral mucosal immunoprevention (OMIP) therapy is an allergy treatment that can induce long-lasting immune tolerance in people already suffering from allergies. By exposing the patient to small, repeated, but increasing doses of the problem allergen over a long period of time, the patient's immune system is eventually desensitized to that particular allergen. OMIP therapy has been shown to be safe in children as young as 2 years old. This study will evaluate if OMIP therapy against common inhaled allergens is safe and effective in preventing the development of asthma in children at high risk for developing the disease. Children enrolled in this study have been diagnosed with eczema or food allergies and have a family history of eczema, allergic rhinitis, or asthma.

There are two groups in this study. Group 1 participants will receive OMIP therapy (a mixture of house dust mite, cat, and timothy grass allergens) as daily oral drops under the tongue for 1 year; Group 2 participants will receive placebo. Participants will be followed for an additional 3 years to see whether they develop allergies or asthma and to determine how OMIP affects how their immune systems respond to allergens. There will be 5 study visits in the first year and 6 visits over the next 3 years. At all visits, participants will be assessed for allergy/asthma symptoms, will be asked to complete questionnaires, and may be asked to provide blood or saliva samples.