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Component of Immune System

Immune system consist of two major components:

  1. Innate Immunity
  2. Adaptive Immunity

The term adaptive immunity is used to refer to part of immune system when one comes across foreign protein or a virus, bacteria and fungi.

Apart from looking at immune system as innate or adaptive immunity, we can think of immune system as composed of various cells and proteins. Each component performs a special task aimed at recognizing foreign material and reacting to it.

The major components of immune system are:

  • B-lymphocytes
  • T-lymphocytes
  • NK cells
  • Phagocytes
  • Complement

Of more than 150 immunodeficiency disorders recognized so far, antibody account for 65%, phagocyte defect 10%, complement deficiency 5%, and rest 15-20% are due to combined cellular and antibody defects.