Efficacy and Safety Study of SCH 900237/MK-8237 in Children and Adults With House Dust Mite-Induced Allergic Rhinitis/Rhinoconjunctivitis (P05607)

Inclusion Criteria: * History of AR/ARC to house dust of 1 year duration or more (with or without asthma) * If female of childbearing potential, has a negative urine pregnancy test at Screening and agrees to remain abstinent or use (or have their partner use) an acceptable method of birth control within the projected duration of the study * Able to read, understand and complete questionnaires and diaries Exclusion Criteria: * Clinically relevant history of symptomatic ARC caused by animal dander, molds and/or cockroach (e.g. present in the home, job, daycare, etc.) or other perennial allergen * History of symptomatic seasonal ARC and/or asthma due to an allergen to which the participant is sensitized and regularly exposed * Nasal condition that could confound the efficacy or safety assessments (e.g., nasal polyposis) * Received an immunosuppressive treatment within 3 months prior to screening * Unstable or severe asthma, or has experienced a life-threatening asthma attack or an occurrence of any clinical deterioration of asthma that resulted in emergency treatment, hospitalization due to asthma, or treatment with systemic corticosteroids (but allowing short-acting beta agonists \[SABAs\]) at any time within 3 months prior to screening * Asthma requiring high-dose inhaled corticosteroids (ICS) within 6 months prior to screening * History of anaphylaxis with cardiorespiratory symptoms with prior immunotherapy, unknown cause or inhalant allergen * History of chronic urticaria…