Which of the following are examples of biological agents?

Biological agents refer specifically to microorganisms, including viruses and bacteria, that can cause harm or disease in humans, animals, or plants. The selection of viruses and bacteria as examples of biological agents is correct because these entities are living or once-living organisms that reproduce and can cause infections or biological effects in hosts.

In contrast, blister agents, nerve agents, and choking agents are categorized as chemical agents. Blister agents, such as mustard gas, cause damage to the skin and eyes. Nerve agents, like sarin or VX, disrupt the nervous system's function. Choking agents, including chlorine gas, primarily damage the respiratory system. These classifications are essential for understanding the different types of threats responders may encounter.

The differentiation between biological and chemical agents helps in developing appropriate response strategies and protective measures, emphasizing the importance of recognizing the specific nature of each type of threat.