<P> The innate immune system, also known as the non-specific immune system or in - born immunity system, is an important subsystem of the overall immune system that comprises the cells and mechanisms that defend the host from infection by other organisms . The cells of the innate system recognize and respond to pathogens in a generic way, but, unlike the adaptive immune system, the system does not provide long - lasting immunity to the host . Innate immune systems provide immediate defense against infection, and are found in all classes of plant and animal life . </P> <P> The innate immune system is an evolutionarily older defense strategy, and is the dominant immune system found in plants, fungi, insects, and primitive multicellular organisms . </P>

When is an animal protected by innate immunity
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