One hundred patients were enrolled, based on sensitization and doctor-diagnosed allergy to HDM. Questionnaires were administered to document demographic and clinical characteristics. Serum IgE reactivity toDermatophagoides pteronyssinus (Dp) extract, Der p 1, Der p 2 and Der p 10 was measured by ImmunoCAP.

Background: The role of specific IgE (sIgE) against Der p 1and Der p 2 in Chinese patients with house dust mite (HDM)allergy has not yet been well investigated.Methods: One hundred patients were enrolled, based on sensitization and doctor-diagnosed allergy to HDM. Questionnaires were administered to document demographic and clinical characteristics. Serum IgE reactivity toDermatophagoides pteronyssinus (Dp) extract, Der p 1, Der p 2 and Der p 10 was measured by ImmunoCAP.

Inclusion Criteria:

• HDM-allergic patients reporting allergic rhinitis, conjunctivitis, asthma and/or atopic dermatitis and who had never undergone immunotherapy, were enrolled if they were sensitized to Dp as judged by ImmunoCAP ( ≥ 1 kU/l) and/or skin reaction index (SRI)by skin-prick test (SPT, a wheal diameter ≥ 0.5 mm).

Exclusion Criteria:

• Patients who refused to participate in the study.

All patients were evaluated by a physician face-to-face, using a detailed questionnaire to establish the nature and severity of their clinical manifestations. The questionnaire also included demographic characteristics, a family history of allergic diseases and any other history of allergic disease.