When further stratified by CD 4 T-cell count/mm3, HIV co-infected XDR TB patients with CD4 cell counts >200/mm3 who received ART had substantially lower risk for death than patients with CD4 cell counts ≤200/mm3 who were not receiving ART (HR 0.094, 95% CI 0.007–1.22), but this result was not significant. Here, CD4 is linked to tuberculosis.