CD4 and tuberculosis: Among those enrolled, a further 205 were excluded from analysis because of duplicate enrolments (n = 5), undocumented ART status at enrolment (n = 4), taking TB treatment at enrolment (n = 15), being diagnosed with TB at enrolment or in the first 3 months of follow up (n = 16), pregnant at enrolment (n = 34), having CD4 counts <350 cells/μl (n = 71) and 60 did not return for any follow up visits and could not be traced.