Anemia prevalence was 88.9% for patients with CD4 count < 50 cells/μl and 85.7% for CD4 count 50-99 cells/μl, 81% for CD4 count 100-199 cells/μl, 65.3% for CD4 count 200-349 cells/μl, 32.7% for CD4 count 350-500 cells/μl and 28.6% for CD4 count > 500 cells/μl (p = 0.000) (Table 6). The gene discussed is CD4; the disease is anemia (phenotype).