NK cell activity, T cell activity (CD + 4 cell a nd CD + 8 cell) and the plasma level of IL-2 with methods of MTT, McAb and E LISA respectively in thirty-one cases of CPHD and ten cases of COPD (as the con trol).

• 单克隆抗体法测定 T淋巴细胞亚群 (CD+ 4细胞、CD+ 8细胞 ) ; 双抗体 EL ISA夹心法测定白细胞介素 2 (IL- 2 )。