What four criteria does the USDA assess to determine Select Agents?

• A. Effect of exposure on animal and plant health, and production and marketability (economic impact); Pathogenicity and methods by which agent/toxin is transferred to animals/plants; availability and effectiveness of pharmacotherapies and prophylaxis to treat and prevent illness; Any other criteria deemed appropriate
• B. Impact on human health only
• C. Color or scent of the agent
• D. Shelf life of the agent in storage

Answer: (A)

The question tests how agencies determine which agents are designated as Select Agents, specifically the broader agricultural and health risk factors considered by USDA. The best answer reflects four key criteria: the impact of exposure on animal and plant health, and on production and marketability; the pathogenicity of the agent and how it can be transmitted to animals or plants; the availability and effectiveness of pharmacotherapies and prophylaxis to treat and prevent illness; and the provision for any other criteria deemed appropriate.

Understanding these helps: the first criterion ensures the designation aligns with real-world harms to livestock, crops, and the economy. The second captures how dangerous the agent is and how easily it could spread in agricultural settings. The third considers whether medical countermeasures exist to control outbreaks, which affects risk and management. The fourth allows the program to address additional relevant factors, such as environmental persistence or trade implications, that could influence national security or agricultural stability.

Why the other ideas don’t fit: focusing only on human health misses the broader impact on animals, plants, and economic consequences; appealing to color or scent has no relevance to risk assessment; shelf life in storage is not a criterion used to determine select-agent status.