Final answer:
The correct biosafety level for working with tuberculosis bacteria in a clinical microbiology lab is BSL-3, which includes specific safety practices and facility requirements.
Step-by-step explanation:
The biosafety level for a clinical microbiology laboratory working with potentially airborne pathogens, such as tuberculosis bacteria, is BSL-3. This level is appropriate for working with microbes or infectious agents that pose a moderate risk to laboratory workers and the community and are typically indigenous. At this level, agents like Mycobacterium tuberculosis, which causes tuberculosis, require laboratories to have restricted access, medical surveillance of workers, use of personal protective equipment (PPE) including respirators, and to utilize all practices within a biological safety cabinet. BSL-3 facilities also feature enhanced controls for airflow and other factors to prevent the release of infectious agents.
BSL-3 agents have the potential to cause lethal infections by inhalation and include pathogens like Mycobacterium tuberculosis. Laboratories working with BSL-3 agents require restricted access, medical surveillance for lab workers, and additional precautions such as wearing a respirator and working with microbes in a biological safety cabinet.