BSL-4 labs are designed and operated for work with:

BSL-4 labs are designed and operated for work with:

• A. Agents that cause high individual risk for life-threatening disease
• B. Agents that are normally found in the United States but are unknown pathogens
• C. Agents that are only transmissible by the aerosol route
• D. Well-characterized agents which do not cause disease in healthy human

Answer: (A)

BSL-4 labs are designed for work with agents that cause life-threatening diseases in humans when there is no available vaccine or therapy. This level provides the highest containment, with dedicated facilities and strict procedures to prevent any release or exposure. Personnel may work in fully encapsulated, positive-pressure, air-supplied suits or in sealed containment units, and all ventilation and waste are treated to prevent escape. Access is tightly controlled, and decontamination steps are required for personnel, equipment, and waste. These layered safeguards are essential because there are no reliable medical countermeasures, so protecting workers and the surrounding environment hinges on maximizing containment at every point.

BSL-4 labs are designed for work with agents that cause life-threatening diseases in humans when there is no available vaccine or therapy. This level provides the highest containment, with dedicated facilities and strict procedures to prevent any release or exposure. Personnel may work in fully encapsulated, positive-pressure, air-supplied suits or in sealed containment units, and all ventilation and waste are treated to prevent escape. Access is tightly controlled, and decontamination steps are required for personnel, equipment, and waste. These layered safeguards are essential because there are no reliable medical countermeasures, so protecting workers and the surrounding environment hinges on maximizing containment at every point.