CD4 and HIV infectious disease: The characteristics of HIV(+) group were as follows: duration of HIV infection M = 3.7 years, SD = 3.2; CD4 + nadir M = 311 cells/μL, SD = 125; CD4+ current M = 599 cells/μL, SD = 193; duration of cART M = 2.9 years, SD = 2.9; 54 % were diagnosed with STD (syphilis) in the past.