Safety of subcutaneous immunotherapy with tyrosine-adsorbed house dust mite extracts in patients with allergic disease

Background: In spite of allergen-specific immunotherapy (SIT) multiple benefits, its use is restricted in some countries owing to concerns about severe adverse reactions. Objective: To evaluate systemic adverse reactions in patients with atopic dermatitis or allergic asthma, allergic rhinitis and allergic conjunctivitis who received subcutaneous immunotherapy with tyrosine-adsorbed Dermatophagoides and Glycyphagoides dust mites extracts. Methods: Retrospective study of the 2007-2015-period that included 773 patients diagnosed with IgE-mediated diseases, where the safety of allergen-specific immunotherapy was described according to the World Organization of Allergy subcutaneous immunotherapy-induced systemic reactions classification system. Results: 79.7 % of patients had rhinitis, 54.9 % asthma, 34.5 % conjunctivitis and 16.4 % atopic dermatitis. Out of 12,546 tyrosine-adsorbed extract doses, 45 systemic reactions were recorded: 12 were grade 1 (30 %), 27 grade 2 (67.5 %) and 1 was grade 3 (2.5 %); the reaction rate was 0.35 per 100 administered injections, for an incidence rate of 5.8 %. No fatal reactions occurred. Conclusion: The frequency of systemic reactions with subcutaneous immunotherapy with Dermatophagoides farinae, Dermatophagoides pteronyssinus and Blomia tropicalis tyrosine-adsorbed extracts was similar to that reported with other extracts