What is the most effective protective measure to prevent contagion of tuberculosis (an airborne pathogen) in a healthcare setting?

Because tuberculosis is transmitted via small airborne particles (respiratory droplet nuclei), an N95 respirator (which filters very small particles and forms a tight seal) is the appropriate protective measure — a standard surgical mask or face shield does NOT provide adequate filtration against the small particle size relevant to TB transmission, since those are designed primarily for larger droplet/splash protection.