Division of Allergy & Clinical Immunology Make an Appointment Ask a Question Refer Patient Rafeul Alam, MD, PhD Division Chief What do we do? We provide comprehensive care in allergic and immunologic disorders. The common allergic and immunologic conditions that we treat include allergic rhinitis, various subtypes of asthma including allergic bronchopulmonary aspergillosis and aspirin/NSAID sensitive asthma (also known as aspirin-exacerbated respiratory disease-AERD), chronic sinusitis, nasal polyps, drug allergy, food allergy, atopic dermatitis (eczema), urticaria, angioedema (histaminergic and kininergic/complement mediated), anaphylaxis, mast cell disorders such as mastocytosis and mast cell activation syndrome, eosinophilic disorders such as Churg-Strauss syndrome, and hypereosinophilic syndrome, and immunodeficiency conditions such as common variable immunodeficiency (CVID), IgA deficiency, and hyper IgE syndrome. We are a specialized referral center for the foregoing illnesses. Our patients are typically referred by their local doctors/specialists because of difficulty in diagnosing or treating the disease. Why National Jewish Health? Our nationally recognized allergy & immunology specialists perform unique consultative services to provide comprehensive clinical care to our patients. Some of the specialized services include allergy diagnostic challenges with drugs, foods, and allergens; and procedures such as aspirin desensitization, drug desensitization, rush and cluster immunotherapy, and laryngoscopy for vocal cord dysfunction and laryngopharyngeal reflux. We are at the forefront of innovative biologics therapy and therapy with immunosuppressive/immunomodulatory agents. Many patients are able to participate in innovative clinical trials that are conducted by our clinicians at National Jewish Health. Other consultative services include pulmonary physiology unit, speech therapy for vocal cord dysfunction, psychosocial medicine, pulmonary rehabilitation, sleep studies, occupational medicine and nutrition. The divisional basic science and clinical research labs provide a unique opportunity to conduct molecular and personalized diagnostic studies on patient samples that aid diagnosis as well management of difficult-to-control allergic, immunologic and respiratory illnesses. Rafeul Alam, MD, PhD + × Rafeul Alam, MD, PhD Rafeul Alam, MD, is an allergist and immunologist at National Jewish Health. Dr. Alam serves as Chief of the Division of Allergy and Clinical Immunology. Chief, Division of Allergy & Clinical Immunology Professor Veda H. and Chauncey H. Ritter Chair in Immunology Department of Medicine Division of Allergy & Clinical Immunology View Full Profile Patient Rating 4.5 out of 5 stars Make an Appointment Division of Allergy & Clinical Immunology Rohit K. Katial, MD + × Rohit K. Katial, MD Rohit K. Katial, MD, is an allergist and immunologist at National Jewish Health. Dr. Katial is in the Division of Allergy and Clinical Immunology. Professor of Medicine Division of Allergy & Clinical Immunology Department of Medicine View Full Profile Patient Rating 4.7 out of 5 stars Make an Appointment Harold S. Nelson, MD + × Harold S. Nelson, MD Harold S. Nelson, MD, is an allergist and immunologist at National Jewish Health. Dr. Nelson is in the Division of Allergy and Clinical Immunology. Professor Department of Medicine View Full Profile Make an Appointment Rafeul Alam, MD, PhD + × Rafeul Alam, MD, PhD Rafeul Alam, MD, is an allergist and immunologist at National Jewish Health. Dr. Alam serves as Chief of the Division of Allergy and Clinical Immunology. Chief, Division of Allergy & Clinical Immunology Professor Veda H. and Chauncey H. Ritter Chair in Immunology Department of Medicine Division of Allergy & Clinical Immunology View Full Profile Patient Rating 4.5 out of 5 stars Make an Appointment Tho Q. Truong, MD + × Tho Q. Truong, MD Tho Q. Truong, MD, is an allergist-immunologist and rheumatologist at National Jewish Health. Dr. Truong is in the Department of Medicine. Associate Professor Department of Medicine Division of Allergy & Clinical Immunology Division of Rheumatology View Full Profile Patient Rating 4.7 out of 5 stars Make an Appointment View all (11) Faculty & Staff in Division of Allergy & Clinical Immunology Find a Doctor Division of Allergy & Clinical Immunology Rafeul Alam, MD, PhD + × Rafeul Alam, MD, PhD Rafeul Alam, MD, is an allergist and immunologist at National Jewish Health. Dr. Alam serves as Chief of the Division of Allergy and Clinical Immunology. Chief, Division of Allergy & Clinical Immunology Professor Veda H. and Chauncey H. Ritter Chair in Immunology Department of Medicine Division of Allergy & Clinical Immunology View Full Profile Patient Rating 4.5 out of 5 stars Make an Appointment Magdalena Maria Gorska, MD, PhD + × Magdalena Maria Gorska, MD, PhD Magdalena Maria Gorska, MD, is a researcher at National Jewish Health. Dr. Gorska is in the Division of Allergy and Clinical Immunology. Associate Professor Department of Biomedical Research Department of Medicine Division of Allergy & Clinical Immunology View Full Profile Flavia Cecilia Lega Hoyte, MD + × Flavia Cecilia Lega Hoyte, MD Flavia Cecilia Lega Hoyte, MD, is an allergist and immunologist at National Jewish Health. Dr. Hoyte is in the Division of Allergy and Clinical Immunology. Associate Professor Director, Allergy & Clinical Immunology Fellowship Department of Medicine Division of Allergy & Clinical Immunology View Full Profile Make an Appointment Rohit K. Katial, MD + × Rohit K. Katial, MD Rohit K. Katial, MD, is an allergist and immunologist at National Jewish Health. Dr. Katial is in the Division of Allergy and Clinical Immunology. Professor of Medicine Division of Allergy & Clinical Immunology Department of Medicine View Full Profile Patient Rating 4.7 out of 5 stars Make an Appointment Brian Modena, MD, MSc + × Brian Modena, MD, MSc Brian Modena, MD, is an allergist at National Jewish Health. Dr. Modena is in the Division of Allergy & Clinical Immunology. Assistant Professor Division of Allergy & Clinical Immunology Department of Medicine View Full Profile Make an Appointment Harold S. Nelson, MD + × Harold S. Nelson, MD Harold S. Nelson, MD, is an allergist and immunologist at National Jewish Health. Dr. Nelson is in the Division of Allergy and Clinical Immunology. Professor Department of Medicine View Full Profile Make an Appointment Kanao Otsu, MD, MPH + × Kanao Otsu, MD, MPH Kanao Otsu, MD, is an allergist and immunologist at National Jewish Health. Dr. Otsu is in the Division of Allergy and Clinical Immunology. Assistant Professor Department of Medicine Division of Allergy & Clinical Immunology View Full Profile Patient Rating 4.1 out of 5 stars Make an Appointment Carah B. Santos, MD + × Carah B. Santos, MD Carah B. Santos, MD, is an allergist and immunologist at National Jewish Health. Dr. Santos is in the Department of Pediatrics and Department of Medicine. Assistant Professor Division of Pediatric Allergy & Clinical Immunology Department of Pediatrics Division of Allergy & Clinical Immunology Department of Medicine View Full Profile Patient Rating 4.7 out of 5 stars Make an Appointment Tho Q. Truong, MD + × Tho Q. Truong, MD Tho Q. Truong, MD, is an allergist-immunologist and rheumatologist at National Jewish Health. Dr. Truong is in the Department of Medicine. Associate Professor Department of Medicine Division of Allergy & Clinical Immunology Division of Rheumatology View Full Profile Patient Rating 4.7 out of 5 stars Make an Appointment Eileen Wang, MD, MPH + × Eileen Wang, MD, MPH Eileen Wang, MD, is an allergist and immunologist at National Jewish Health. Dr. Wang is in the Division of Allergy and Clinical Immunology. Assistant Professor Division of Allergy & Clinical Immunology Department of Medicine View Full Profile Patient Rating 4.9 out of 5 stars Make an Appointment Richard W. Weber, MD + × Richard W. Weber, MD Richard W. Weber, MD, is a Professor Emeritus at National Jewish Health. Dr. Weber was in the Division of Allergy and Clinical Immunology. Professor Emeritus Department of Medicine Division of Allergy & Clinical Immunology View Full Profile Find a Doctor Nurses & Medical Staff Rachel Alvidrez, RN Dalana Bernt, RN Alison Henry, RN Barbara Strain, RN Fellows Meghan Garcia, MD Mohini Pathria, MD Lorelei Vandiver, MS, MD Nicole Barberis, MD Amar Dixit, MD Lara Gross, MD Programs and Services Allergy Treatment Programs (Adult) Asthma Treatment Program (Adult) Hives Treatment Programs Immune Deficiency Program Sinusitis Treatment Program Conditions We Treat Allergic Bronchopulmonary Aspergillosis (ABPA) Allergic Rhinitis (Hay Fever) Allergy Overview Anaphylaxis Angioedema Asthma Overview Eczema (Atopic Dermatitis) Overview Eosinophilic Granulomatosis with Polyangiitis (EGPA) Eosinophilic Lung Diseases Food Allergies Hives (Urticaria) Hypereosinophilic Syndromes Immune Deficiency Disorders Mastocytosis Medication/Drug Allergy Sinusitis Research Our Division has research labs housing a number of investigators with diverse research interests. Learn about our research. Education Complete the online Faculty evaluation form here.