<unk>  are crucial to the immune system as they have the ability to ingest and kill foreign pathogens encountered by the body. In<unk> <unk> cell<unk> , the ability of<unk>  to kill foreign pathogens is impaired, leading to widespread infections.<unk>  can be divided into two types including<unk>  of<unk> number and<unk>  of<unk> function.
Congenital defects of phagocytes
Humoral immune deficiency
Defects in intrinsic and innate immunity
Congenital disorders of the bone marrow
Natural killer cell deficiency
Complement deficiencies
Immunoproliferative disorders
Complement deficiency