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Allergies An allergy is a chronic condition involving an abnormal reaction to an ordinarily harmless substance called an allergen. If you have an allergy, your immune system views the allergen as an invader and a…

Asthma Asthma is a chronic disease that affects the airways and lungs.  According to the World Health Organization (WHO), approximately 300 million people worldwide and 14–17 million people in the United States are affected by…

Immunology According to the leading experts in immunology, when part of the immune system is either absent or not functioning properly, it can result in an immune deficiency disease. When the cause of this deficiency…