Immunology is nothing but the study of the immune system and is the important branch of the medical and biological sciences. The immune system supports us to protect us from infection through numerous ways to defend. If the immune system is not operative as it should, it can result in disease, such as autoimmunity, allergy and cancer.  Now it becomes clear that immune reactions donate to the evolution of various mutual conditions not traditionally viewed as immunologic, including metabolic, cardiovascular, and neurodegenerative situations such as Alzheimer’s