Study to Assess the Safety and Effectiveness of Beltavac® Polymerized With House Dust Mites

Inclusion Criteria: * Patients from 3 to 11 years suffering from a clinically relevant Dermatophagoides farinae and Dermatophagoides pteronyssinus induced allergic rhinitis or rhinoconjunctivitis associated with or not with asthma * Positive skin testing * Positive Serum-Specific IgE determination * Parental or legal representative informed consent * Clinical sintomatology on the inclusion period Exclusion Criteria: * Patients suffering from acute or chronic infections or inflammations * Patients suffering from uncontrolled and severe asthma * Patients with a known autoimmune disease * Patients with active malignant disease * Patients requiring beta-blockers * Patients having any contraindication for the use of adrenaline * Patients with previous immunotherapy with this allergen or another allergen with cross-reaction * Patients with immunotherapy treatment at the time of inclusion