If we think of the immune system as an army fighting infections white blood cells are the soldiers They are called lymphocyte(淋巴细胞) There are special lymphocyte called CD4 helper lymphocyte(辅助淋巴细 胞) They coordinate the immune systems attack on foreign organismsIf we think of the immune system as an army fighting infections, white blood cells are the soldiers. They are called lymphocyte (淋巴细胞). There are special lymphocyte called CD4 helper lymphocyte (辅助淋巴细 胞). They coordinate the immune system’s attack on foreign organisms