CD4 and tuberculosis: Our TB incidence results of 17.9/100 PYs and 95% CI of (10.4–30.8) in PLWH with < 100 CD4 T cells/μl, are similar to those of 25.5/100 PYs and 95% CI of (21.6–30.3) found in a PLWH cohort with similar CD4 T cell values in South Africa [39].