Which bioterrorism agent category includes agents such as anthrax, smallpox, and viral hemorrhagic fevers?

• A. Category A
• B. Category B
• C. Category C
• D. Not categorized

Answer: (A)

High-risk bioterrorism agents are grouped in the highest category because they pose the greatest threat to public health and national security due to their potential for rapid spread and severe illness or death. Anthrax, smallpox, and viral hemorrhagic fevers exemplify this category because of their characteristics that demand urgent public health action: smallpox spreads readily from person to person and has a high mortality rate; anthrax can be disseminated as durable spores and inhalational infection carries high fatality if not treated quickly; viral hemorrhagic fevers can trigger explosive outbreaks with high case-fatality and require rapid isolation, contact tracing, and specialized infection control.

Being in this top category signals the need for the strongest readiness measures, including vaccination where available, stocked vaccines and therapeutics, heightened surveillance, and strict biosafety and infection-control precautions. Other categories cover agents that are less easily disseminated, cause lower mortality, or are emerging threats with potential to become more problematic in the future.