Innate vs. Adaptive Immunity

monocyte NK cell macrophage
basophil eosinophil neutrophil

Different white blood cells of the mammalian innate immune system

All animals possess a non-specific defense system called the innate immune system. Innate immune responses attack microbes indiscriminately.

Vertebrates have an additional and powerful immune response called adaptive immunity. This feature focuses on elements of adaptive immune system.