"Biological agents are organisms, or toxins derived from living organisms, that can be used against people, animals, or crops. In contrast, chemical agents, poisonous substances that can kill or incapacitate, are man-made materials. The agents used for biological warfare are drawn from pathogens and toxins that exist in nature. Among the pathogens that have been adopted as biological warfare agents are the organisms that cause smallpox, anthrax, plague, tularemia, brucellosis, and Q-fever. However, a terrorist could use virtually any pathogen or toxin. Terrorists could employ agents or dissemination techniques different from those adopted by military programs. Thus, while military biological warfare programs have concentrated on aerosol dispersal of biological agents, terrorists have shown a greater interest in contamination of food and water."
Strategic Forum No.127