Finally, anemia among HIV-infected adults was significantly associated with being HIV-infected for five or more years (AOR: 2.32; 95% CI: 1.08–4.94, P = 0.030); being on clinical stage III or more (AOR: 4.20; 95% CI: 1.06–16.62, P = 0.041); having CD4 cell count below 200 cells/mm3 (AOR: 4.32; 95% CI: 2.10–8.86, P< 0.001) and BMI below 18.5 kg/m2 (AOR: 3.82; 95% CI: 1.83–8.00, P< 0.001) (Table 3). The gene discussed is CD4; the disease is anemia (phenotype).