Biological warfare, also known as germ warfare, is the use of any organism (bacteria, virus or other disease-causing organism) or toxin found in nature, as a weapon of war. It is meant to incapacitate or kill an adversary. It may also be defined as the employment of biological agents to produce casualties in man or animals and damage to plants or material; or defense against such employment.

The creation and stockpiling of biological weapons is outlawed by the 1972 Biological Weapons Convention, signed by over 100 countries, because a successful attack could conceivably result in thousands, possibly even millions, of deaths and could cause severe disruptions to societies and economies. Oddly enough, the convention prohibits only creation and storage, but not usage, of these weapons. However, the consensus among military analysts is that, except in the context of bioterrorism, biological warfare is militarily of little use.

The main problem is that a biological warfare attack would take days to implement, and therefore, unlike a nuclear or chemical attack, would not immediately stop an advancing army. As a strategic weapon, biological warfare is again militarily problematic, because unless it is used to poison enemy civilian towns, it is difficult to prevent the attack from spreading, either to allies or to the attacker, and a biological warfare attack invites immediate massive retaliation, usually in the same form.

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