Anthrax is caused by Bacillus anthracis, a large, nonmotile, spore-forming, gram-positive rod. B. anthracis is common among domestic animals. It can be passed to humans by direct skin contact or inhalation of anthrax spores. Although the vegetative form survives poorly outside of a host [18] , the spore form can survive for decades [19] . It has many characteristics of an ideal biological weapon, its production is simple and cheap, and it can be stored for long periods of time. It is highly effective, with a morbidity rate of 65 to 80% if treatment is not promptly initiated. Weaponized anthrax can be produced as insoluble, liquid slurry, or dry powder. Although the most likely method of deployment is aerosolization of dry spores [20] , contamination of food and water supplies is conceivable [21] . The most serious terrorist threat posed by anthrax is infection by inhalation. For humans, the dose sufficient to kill half of the exposed persons ranges from 2500 to 55,000 inhaled spores [18, 22] . According to a U.S. government estimate, the outdoor release of 100 kg of B. anthracis in Washington, D.C. could produce between 130,000 and 3 million deaths [23] . Anthrax has been weaponized at various times in the past, most recently in October and November of 2002 in the U.S., which led to 18 confirmed and 4 suspected cases of disease [24] . Infection is acquired by ingestion, inhalation, or absorption of the spores through breaks in the skin and mucous membranes. Depending on the route of exposure, cutaneous, gastrointestinal (GI), or inhalation anthrax ensues.