Which of the following is NOT a characteristic of Tier 1 agents?

The choice indicating that Tier 1 agents are easily treatable is correct in identifying a characteristic that is not typical of these agents. Tier 1 agents are classified as the highest priority biological threats due to their capability to cause substantial public health issues, mass panic, and their potential for high mortality rates.

In the context of Tier 1 agents, such as certain bioweapons or emerging infectious diseases, many of these agents pose significant treatment challenges. They may require specialized medical responses, and effective treatments or vaccines may not be readily available. The ability to rapidly disseminate through aerosol means, along with their high mortality rates, compounds the severity of these threats and the urgency in responding to potential exposures.

Therefore, the assertion that these agents are "easily treatable" does not align with their typical characteristics, further emphasizing the nature of the risk they pose to public health and safety.