Clinico-immunologic study on immunotherapy with mixed and single insect allergens

Area of Science:

• Allergy and Immunology
• Respiratory Medicine

Background:

• Immunotherapy (IT) is a common treatment for allergies, often using single or mixed allergen vaccines.
• Research on mixed allergen preparations for immunotherapy is less common.

Purpose of the Study:

• To evaluate the efficacy of mixed and single insect allergen immunotherapy in patients with allergic rhinitis and asthma.
• To compare clinical and immunological outcomes between mixed and single allergen IT.

Main Methods:

• A 1-year, double-blind, placebo-controlled trial involving 99 patients with asthma or allergic rhinitis.
• Patients received either active allergen IT (single or mixed insect extracts) or placebo.
• Clinical assessments included symptom scores, lung function (FEV1), and immunological markers (IgE/IgG4, IgG1/IgG4 ratio).

Main Results:

• Active IT significantly improved symptoms, FEV1, and IgG4 levels compared to baseline and placebo (p < 0.05).
• No significant differences were observed between mixed and single allergen IT groups for clinical or immunological changes.
• Increased IgG4 levels positively correlated with clinical improvement.

Conclusions:

• Immunotherapy using two to three mixed insect allergen extracts from the same group is effective for treating insect hypersensitivity.
• Both mixed and single allergen immunotherapy demonstrate comparable efficacy in managing allergic rhinitis and asthma.