This presentation examines the various biological agents that terrorists could use against food or water supplies. This presentation's content is part of a non-credit, professional development training generated by JHSPH faculty and the Johns Hopkins Center for Public Health Preparedness. The OCW version of this presentation comprises slides only. A full version, including synchronized audio is available at no charge by visiting the Johns Hopkins Center for Public Health Preparedness (registration required). Topics covered here include: 1: Microbes as Biological Weapons, 2: Microbial Characteristics of Interest to Perpetrators, 3: CDC Classification of Bioterrorism Microorganisms, and 4: Food and Waterborne Microbial Threats.