Positive Ziehl-Neelsen sputum stain, with magenta-colored acid-fast bacilli on a blue background. (Courtesy of the Centers for Disease Control and Prevention.) Source: Chapter 204. Tuberculosis, Principles and Practice of Hospital Medicine Citation: McKean SC, Ross JJ, Dressler DD, Brotman DJ, Ginsberg JS. Principles and Practice of Hospital Medicine; 2012 Available at: http://accessmedicine.mhmedical.com/DownloadImage.aspx?image=/data/books/mcke1/mcke1_c204f004.png&sec=41319761&BookID=496&ChapterSecID=41304191&imagename= Accessed: October 27, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved