HIV patients with CD4 counts(\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$\le 200$$\end{document}≤200 and 200–349 cell/mm3 had shorter TB free co-infection survival time. Here, CD4 is linked to tuberculosis.