A nurse is caring for a patient with suspected tuberculosis (TB) who has been placed in airborne precautions. Which action by the nurse demonstrates correct implementation of airborne precautions?

Airborne precautions for TB require an N95 respirator to filter airborne droplet nuclei. Surgical masks, open doors, or standard precautions alone are insufficient for this highly contagious airborne disease.

Understanding Airborne Precautions for Tuberculosis

When caring for a patient with suspected or confirmed pulmonary tuberculosis, the primary goal is to prevent the inhalation of infectious droplet nuclei. Mycobacterium tuberculosis is transmitted through the airborne route, meaning the bacteria are carried in tiny particles (less than 5 microns) that can remain suspended in the air for hours and travel through ventilation systems. Standard surgical masks are insufficient because they are loose-fitting and do not filter these small airborne particles. The correct implementation of airborne precautions requires a properly fitted, fit-tested N95 respirator or a powered air-purifying respirator (PAPR), which filters at least 95% of airborne particles, creating a tight facial seal to protect the healthcare worker from inhalation exposure ^[1].

The rationale for this strict approach is grounded in the occupational risk described in infection prevention literature. Healthcare workers have persistent contact with potentially infectious patients, making primary preventive interventions—those that aim to diminish exposure at the source—essential ^[1]. Wearing an N95 respirator is a critical component of these primary interventions, acting as a barrier at the portal of entry, the respiratory tract. The narrative review on TB prevention strategies emphasizes that effective preventive interventions must be comprehensively evaluated and implemented to reduce the occupational burden of tuberculosis among healthcare workers ^[1]. This directly supports the action of using an N95 respirator as a non-negotiable standard of care.

The other options fail to meet the requirements for airborne precautions. Placing the patient in a private room is correct, but the door must remain closed to maintain negative pressure, which prevents contaminated air from escaping into the hallway. Leaving the door open for ventilation would breach this environmental control. Relying on standard precautions alone is a critical error, as standard precautions include hand hygiene and glove use for contact with body fluids but do not provide respiratory protection against airborne pathogens. The discussion of complex infection prevention decisions highlights that in high-stakes scenarios where guidance is clear, such as TB management, strict adherence to established protocols for healthcare worker protection is mandatory to mitigate significant safety and legal risks . Therefore, the N95 respirator is the only option that aligns with the hierarchy of controls for airborne infectious diseases.