CD4 and cytomegalovirus retinitis: No CMV retinitis was observed in 65 patients with CD4+ T lymphocyte counts between 350 to 200 cells/μl and one CMV retinitis out of 69 patients with CD4+ T lymphocyte counts between 199 to 100 cells/μl (prevalence 1.4%, 95% confidence interval: 0.0,7.8).