There is an overall lack of knowledge regarding the natural history and ecology of these zoonotic organisms (5) . There is an abysmal lack of understanding among the general public and media of the natural occurrence of many biological organisms in the agricultural and animal industry setting as well as in free-ranging animal populations. The natural history, normal ecology, and epidemiology of potential agents of bioterrorism provide scenarios for explaining risk to the human population at large. Understanding the natural history of these organisms and their role in agriculture and free-ranging animal populations provides a context for health care providers to make appropriate risk assessment decisions.