Humans have an acquired immune system that produces antibodies to neutralize pathogens. However, the innate immune system is still present at the time of birth because it:
is very specific and uses different macrophages
produces memory cells for mounting a fast secondary response
has natural killer cells that can phagocytose and destroy microbes
provides passive immunity
innate immunity is a non-specific type of defense present at the time of birth. It includes cellular barriers such as 'natural killer (type of lymphocytes) in the blood as well as macrophages in tissues' which 'can phagocytose and destroy microbes'. In contrast, specificity and memory cells are characteristics of acquired immunity.
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