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Q.
Humans have acquired immune system that produces
antibodies to neutralise pathogens. Still innate
immune system is present at the time of birth because
it
Human Health and Disease
Solution:
Innate immunity is the non-specific type of defence
that is present at the time of birth because it has natural
killer cells which can phagocytose and destroy microbes
(cellular barriers). Other forms of innate immunity are
physical, physiological and cytokine barriers.