In case of an attack, a large number of victims could be affected in a very short period of time, putting an enormous strain on the healthcare system [3] . Personnel will be faced with enormous logistical problems, and medications and other resources are likely to be insufficient [4] . Therefore, the United States (U.S.) Centers for Disease Control (CDC) urges healthcare professionals to be familiar with warfare agents, and in conjunction with governmental organizations have an implemented "Bioterrorism Preparedness and Response Program" to quickly detect and appropriately respond to a potential bioterrorist attack [5] . Early recognition is key in minimizing casualties, initiating appropriate therapy, and preserving resources. However, symptoms and signs caused by those warfare agents are often nonspecific and can easily be mistaken for common diseases. An important concept in differentiating a naturally occurring epidemic from a terrorist attack consists of recognizing an epidemiologic pattern [6] . Clues that suggest an attack include unusual age distribution or clustering of an illness [7] , a rapidly increasing incidence of an illness [8] , as well as an increased occurrence of an unusual illness or death in animals.