CD4 and AIDS: With the standard regimen, the patient has CD4+ T cell counts that dip below 200 cells/\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$\upmu $$\end{document}μL, which is the clinical threshold for acquired immunodeficiency syndrome (AIDS).