Health issues, including infectious diseases, have affected world history more extensively than most of us can imagine. In today’s world, international trade and travel threaten pandemics by transporting and spreading diseases globally at jet speed. The growing risk of exposure to infectious disease, coupled with the looming threat of bioterrorism, creates a situation in which health and security are interacting with greater frequency and intensity. This development parallels post-Cold War efforts to redefine the concept of security to encompass new global challenges. How did epidemics function as causal agents of historical change? What are the major linkages between health and security? Should new global health challenges (e.g., non-commu...