Anthrax, Botulism, Plague, Smallpox, Tularemia, and viral hemorrhagic fevers are CDC Class ____ agents?

• A. Class C
• B. Class B
• C. Class A
• D. Not classified

Answer: (C)

High-priority bioterrorism agents are designated Class A because they pose the greatest risk to public health and national security. They are defined by features that demand urgent, widespread public health action: they can be easily transmitted or disseminated, they cause high mortality or serious public health impact, and they require specialized preparedness and response capabilities to prevent or limit outbreaks.

The agents listed fit this category because each can lead to severe illness or death and has the potential to spread rapidly or be disseminated in ways that challenge health systems. Anthrax spores can be released as an aerosol, leading to dangerous inhalational disease; botulinum toxin is one of the most potent toxins known, requiring rapid recognition and a highly coordinated response; plague, particularly pneumonic plague, can spread between people and cause deadly outbreaks without swift action; smallpox is highly contagious and historically caused large, rapid outbreaks with high mortality; tularemia can be highly infectious via inhalation and cause severe disease; and viral hemorrhagic fevers, such as Ebola or Lassa, have high fatality rates and require strict infection control and rapid public health intervention.

Because these characteristics demand the most stringent surveillance, diagnostics, isolation, vaccination or post-exposure measures, and coordination with law enforcement and emergency management, they are categorized as Class A.