Which scenario would most clearly require airborne precautions with an N95 mask?

• A. A patient with a skin infection
• B. A patient with a common cold
• C. A patient with a urinary tract infection
• D. A patient with confirmed tuberculosis exposure

Answer: (D)

Airborne precautions are essential for infections spread by tiny aerosol particles that can remain suspended in the air and be inhaled. Tuberculosis spreads through these small droplet nuclei, which can travel beyond close contact and linger in the environment. Because of this, healthcare workers must use a properly fitted N95 respirator to filter out the inhaled particles, and care is taken in a private or negative-pressure room to contain any aerosols.

The other scenarios involve infections typically transmitted by larger droplets or by direct contact. A skin infection is usually spread by contact with contaminated surfaces or skin-to-skin contact, not through the air. A common cold is primarily spread by larger respiratory droplets and close contact, so droplet precautions with a surgical mask are generally used rather than airborne precautions. A urinary tract infection spreads via the urinary tract and surface contact rather than through inhalation of airborne particles.

Therefore, the situation with confirmed tuberculosis exposure is the one that most clearly requires airborne precautions with an N95 mask.