This four and half minute video shows how to prepare an Acid-Fast Stain using the Ziehl-Nielsen Method. This resource was developed by Charles Adjei Osei of the Kwame Nkrumah University of Science and Technology and Cary Engleberg of the University of Michigan. It is part of a larger learning module about laboratory methods for clinical microbiology. The full learning module, editable animation, and video transcript are available at http://open.umich.edu/education/med/oernetwork/med/microbiology/clinical-microbio-lab/2009. Copyright 2009-2010, Kwame Nkrumah University of Science and Technology and Cary Engleberg. This is licensed under a Creative Commons Attribution Noncommerical 3.0 License http://creativecommons.org/licenses/by-nc/3.0/. Video transcribed by Andrea Matsumoto (University of Michigan).