Biological agents are microorganisms, such as bacteria, viruses, or toxins, that can cause disease in humans. They can be spread through the air, water, food, or contact with an infected person or animal. Although biological agents can be used as weapons, they can also occur naturally, such as in the case of an outbreak of a disease like the flu.
There are a number of things that can be done to avoid becoming a biological agent casualty. These include: