What is the difference between acquired and natural immunity?

Natural Immunity is created by the body's natural barriers, such as the skin, and protective substances in the mouth and nose, the urinary tract, and on the eye surface. Very young babies have some immunity (natural) properties passed to them by their mother when in the womb, but this only lasts a short time.

Not only does the immune system provide protection from infection through natural barriers, but it also adapts itself to provide immunity against infection by "remembering" the infectious microorganism from a previous exposure.

Acquired immunity develops through exposure to specific foreign microorganisms, toxins, and/or foreign tissues, which is "remembered" by the body's immune system. When that antigen enters the body again, the immune system "remembers" exactly how to respond to it, such as with chickenpox.

Once a person is exposed to chickenpox, or the chickenpox vaccine, the immune system will produce specific antibodies against chickenpox. When that same person is exposed to chickenpox again, the immune system will trigger the release of the particular chickenpox antibodies to fight the disease. The degree and duration of immunity depend on the type and amount of antigen and how it enters the body.

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