Regarding TB exposure, which statement is correct?

• A. An individual exposed to TB without symptoms does not place others at risk at this time.
• B. Any TB exposure requires immediate airborne isolation of the person.
• C. Latent TB requires airborne isolation.
• D. A positive TB test is necessary before any precautions are taken.

Answer: (A)

Contagiousness with TB depends on active disease, not mere exposure. A person who has been exposed but has no symptoms is not contagious, because latent TB infection and exposure in themselves do not spread the bacteria through the air. Airborne isolation is reserved for those with suspected or confirmed active TB, typically when coughing or other symptoms suggest infectious pulmonary TB. A positive TB test shows infection but does not by itself require precautions; it may indicate latent infection, which is not contagious, or may lead to further evaluation for active disease. So the statement that an individual exposed to TB without symptoms does not place others at risk at this time is the correct understanding.