CCR9 and gonorrhea: The CCR9+ cells were 4.2 times more frequent on PBMC from patients with PAC than in HC (P = 0.01), and the CD4+ T cells expressing CCR9 were 2.5 times more frequent in patients with PAC than in HC (P = 0.01) (Figures 2(c) and 2(f)) (Table 1).