Respiratory Tract Diseases Diseases 40 Respiratory organs 26 Lung Diseases 15 Respiratory System Diseases 8 Appareil respiratoire 7 Health & Biological Sciences 7 Medicine 7 Respiratory System 7 Health Care 6 Lungs 6 Maladies 6 Diagnostic Techniques and Procedures 5 Health Care Quality, Access, and Evaluation 5 Immune System Diseases 5 Respiratory Tract Infections 5 Tuberculosis 5 Chest 4 Hypersensitivity 4 Lung Diseases, Obstructive 4 Respiratory Hypersensitivity 4 Treatment 4 Asthma 3 Bacterial Infections 3 Bacterial Infections and Mycoses 3 Bronchial Diseases 3 Health Care Evaluation Mechanisms 3 Hypersensitivity, Immediate 3 Investigative Techniques 3 Pathological Conditions, Signs and Symptoms 3