The immune system is the body's natural defense system that helps fight infections.
The immune system is made up of antibodies, white blood cells, and other chemicals
and proteins that attack and destroy substances such as bacteria and viruses that
they recognize as foreign and different from the body's normal healthy tissues.
The immune system is also responsible for allergic reactions and allergies, which
may occur when the immune system incorrectly identifies a substance (allergen), such
as pollen, mold, chemicals, plants, and medicines, as harmful.
Sometimes the immune system also mistakenly attacks the body's own cells, which is
known as an autoimmune disease.
Medical Review:E. Gregory Thompson, MD - Internal Medicine & Adam Husney, MD - Family Medicine & Elizabeth T. Russo, MD - Internal Medicine
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