A biochemical agent refers to a substance that can cause harm to living organisms through chemical reactions or biological processes. These agents can be natural, like toxins produced by certain bacteria, or synthetic, created in laboratories for research or military purposes. They can affect health by disrupting normal biological functions, leading to illness or death. Biochemical agents are often categorized into two main types: biological agents, which include viruses and bacteria, and chemical agents, which are toxic chemicals like nerve agents. Understanding these agents is crucial for public health, safety, and defense against potential threats.