Anthrax

Anthrax is an infectious and often fatal disease contracted from animals. Cutaneous anthrax can be contracted through a break in the skin. Bacteria and toxin spread through the bloodstream causing shock, cyanosis (bluish-purple discolouration of the skin), sweating, collapse and death in up to 20% of untreated cases. Inhalation anthrax can be contracted by breathing in anthrax spores, resulting in pneumonia, sometimes accompanied by meningitis, followed by death. Gastrointestinal anthrax can be contracted by the consumption of contaminated meat and is characterised by an acute inflammation of the intestinal tract. Initial signs of nausea, loss of appetite, vomiting and fever are followed by abdominal pain, vomiting blood and severe diarrhoea and results in death in up to 60% of cases. Because its spores have a long survival period, the incubation period is short, and the disability severe, anthrax has long been developed as a biological weapon. Current vaccines do not provide immediate immunity and antibiotics are not effective against the lethal toxins produce by the bacteria once released into the blood.

Sources:
http://www.yourdictionary.com/library/bioterrorism.html
http://www.bt.cdc.gov/agent/anthrax/faq/signs.asp