Which of the following is not a characteristic of tier 1 agents?

• A. Easily Treatable
• B. Highly Lethal
• C. Highly Transmissible
• D. Severe Disease Potential

Answer: (A)

Tier 1 agents are defined by their potential to cause mass casualties and serious public health impact, which comes from their high lethality, strong transmissibility, and potential for severe disease. Because of these factors, effective treatment is not easily available or reliably curative in real-world outbreak conditions; many of these agents lack widely effective therapies or vaccines, and response relies heavily on containment and specialized public health measures. That makes “easily treatable” not a characteristic of Tier 1 agents. The other traits—being highly lethal, highly transmissible, and capable of causing severe disease—are the kinds of features that drive such agents into Tier 1 status.