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Bioterrorism agents are living organisms, such as bacteria, viruses, or fungi, or toxins that are deliberately used to sicken and kill. They may be used by terrorists partially because of their psychological impact on the public and partially because they can be deadly, are easy to distribute, are a relatively inexpensive weapon, and are difficult to detect. Bioterrorism agents have been used in acts of warfare for thousands of years. This has included dipping arrows into toxins, poisoning food and water supplies, and deliberately spreading deadly infections. Bioterrorism agents can be carried in food products, dispersed into the air or drinking water, introduced into crops and livestock.