A state of host‐mediated resistance defending against foreign agents or organisms encountered on or within the tissues that is capable of distinguishing between self and nonself.

Nonsusceptibility to the invasive or pathogenic effects of foreign microorganisms or to the toxic effect of antigenic substances.

The ability to resist infection and to heal. The process may involve acquired immunity, the ability to learn and remember a specific infectious agent, or innate immunity (the genetically programmed system of responses that attack, digest, remove, and initiate inflammation and tissue healing).


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