Besides, the average change in \documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$\sqrt{CD4}$$\end{document}CD4 cell counts over time for those who were co-infected with TB indicated that they remained constant in the first 5 months, followed by a modest decrease of up to 10 months. This evidence concerns the gene CD4 and tuberculosis.