The prevalence of anemia varies markedly across different socioeconomic and clinical settings [12, 19]. A study among ART-naïve patients showed that the prevalence of anemia was 30.5% among patients with CD4+ T cell count < 200 cells/μL, and 60.1% among patients aged ≥ 60 years [20]. This evidence concerns the gene CD4 and anemia (phenotype).