Moderately severe anemia was seen in 35.2% and 13.6% of patients with CD4 count < 200cells /μl and CD4 count ≥200cells /μl, respectively, (p = 0.001); in 9.5%, 12.3%, 28.1% and 35% of patients with WHO clinical stage I, II, III and IV, respectively, (p = 0.007) (data not shown); in 7.1% and 24.6% of HAART and HAART naïve patients, respectively (p = 0.017) (Table 5). The gene discussed is CD4; the disease is anemia (phenotype).