Immunity that has been inherited in contrast to one that has been acquired. If an individual acquires immunity by having the disease in question, as opposed to acquiring it as the result of vaccination, then that individual is said to have natural acquired immunity.
Immunity is the body’s ability to resist attack or overcome infection by invading microbes or larger parasites.
Immunity is based on the proper functioning of the body’s immune system. Cells, cell products, organs, and structures of the body involved in the detection and destruction of foreign invaders, such as bacteria, viruses, and cancer cells. Immunity is based on the system’s ability to launch a defense against such invaders. For the system to function properly, it must be able to distinguish between the material of its own body (self) and material that originates outside of it (nonself). Failure to make this distinction can result in autoimmune diseases.
In natural or innate immunity, immune mechanisms present at birth work against a wide variety of microbes whether or not they have been encountered before.