CD4 and infection: During continued tenofovir treatment, there was a gradual increase of CD4+ T lymphocyte values to normal pre-infection levels (percentage of CD4+ T lymphocytes: 30–39%; CD4+/CD8+ T-cell ratio 1.25–1.75; absolute CD4+ T lymphocyte counts: ≥ 700 per μl; Fig. 3, 8).