(1)Immunity that is naturally present and is not due to prior sensitization to an antigen from, for example, an infection or vaccination. Since it is not stimulated by specific antigens, innate immunity is generally nonspecific. It is in contrast to acquired immunity. Also called natural immunity.
(2) Natural Immunity - Immunity that is naturally existing, Natural immunity does not require prior sensitization to an antigen
(3) This includes local barriers to infection such as skin, stomach acid, mucous, the cough reflex, enzymes in tears and saliva and skin oils. Immunity to disease that occurs as part of an individual's natural biologic makeup.Immunity brought about by the possession of suitable antibodies to fight the infection, which may have remained from a past infection or passed on from the mother.