CD4 and tuberculosis: Univariate Cox regression analysis shows that a baseline CD4 cell count of 200–349 cells/μL, < 200 cells/μL, a positive baseline IGRA, and a baseline HIV viral load ≥ 100,000 copies/mL were associated with a 2-fold, 3-fold, 4-fold, and 10-fold increase in risk for incident active TB, respectively (Table 3), though not reaching statistical significance for CD4 cell count.