CD8A and HIV infectious disease: For HIV infected patients, the average duration for HIV infection is 13.4 years ± 3.51; the pre-therapy viral load varies from 5208 to 750,000, the average is 349301.6; CD4+ T cell count is from 360 to 1050, the average is 658; CD8+ T cell count is from 680 to 1380, the average is 1025.8.