Component of Immune System
Immune system consist of two major components:
- Innate Immunity
- 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.