If C. burnetii suspected and/or confirmed samples or cultures are being handled in a laboratory, at what biosafety level (BSL) should personnel be working?

If C. burnetii suspected and/or confirmed samples or cultures are being handled in a laboratory, at what biosafety level (BSL) should personnel be working?

• A. BSL-1
• B. BSL-2
• C. BSL-3
• D. BSL-4

Answer: (C)

Coxiella burnetii is highly infectious via the inhalation route, and handling samples or cultures can easily generate infectious aerosols. Because of this, containment must be strong enough to prevent aerosol exposure to personnel, which is provided by BSL-3. BSL-3 adds critical protections: primary containment through certified biosafety cabinets, and secondary containment through facility design features like negative pressure, controlled access, and dedicated ventilation. It also guides use of appropriate respiratory protection and specific work practices to minimize aerosol generation and exposure. These measures are essential for Coxiella burnetii due to its low infectious dose and potential to cause serious disease. In contrast, BSL-2 does not offer sufficient containment for aerosolizable pathogens, BSL-1 is suitable only for nonpathogenic organisms, and BSL-4 is reserved for the most dangerous pathogens with no approved vaccines or treatments. Therefore, the appropriate level for handling suspected or confirmed samples or cultures of Coxiella burnetii is BSL-3.

Coxiella burnetii is highly infectious via the inhalation route, and handling samples or cultures can easily generate infectious aerosols. Because of this, containment must be strong enough to prevent aerosol exposure to personnel, which is provided by BSL-3.

BSL-3 adds critical protections: primary containment through certified biosafety cabinets, and secondary containment through facility design features like negative pressure, controlled access, and dedicated ventilation. It also guides use of appropriate respiratory protection and specific work practices to minimize aerosol generation and exposure. These measures are essential for Coxiella burnetii due to its low infectious dose and potential to cause serious disease.

In contrast, BSL-2 does not offer sufficient containment for aerosolizable pathogens, BSL-1 is suitable only for nonpathogenic organisms, and BSL-4 is reserved for the most dangerous pathogens with no approved vaccines or treatments. Therefore, the appropriate level for handling suspected or confirmed samples or cultures of Coxiella burnetii is BSL-3.