CD8A and bronchiectasis: The proportion of CD8 cells in BAL fluid was significantly diminished in patients with bronchiectasis compared to the control group (11.84 ± 4.41 versus 15.76 ± 6.84; p = 0.01), while the absolute number of CD8 cells showed no significant difference between the two groups (1.13 ± 0.35 versus 1.16 ± 0.37; p = 0.82).