Which statement best describes the contagiousness of latent TB?

Which statement best describes the contagiousness of latent TB?

• A. Contagious only when symptoms develop
• B. Contagious
• C. Always contagious
• D. Not contagious

Answer: (D)

Latent TB infection means the bacteria are present but dormant, and the person has no symptoms. Because the bacteria are inactive and contained by the body's immune response, there are no infectious particles being released into the air, so it cannot spread to others. Contagiousness occurs only when TB becomes active, with symptoms like a persistent cough and other signs that patients can transmit bacteria through respiratory droplets. So, latent TB is not contagious. It’s also useful to remember that latent TB can reactivate later if the immune system weakens, which is why screening and, in some cases, treatment are important to prevent future active disease.

Latent TB infection means the bacteria are present but dormant, and the person has no symptoms. Because the bacteria are inactive and contained by the body's immune response, there are no infectious particles being released into the air, so it cannot spread to others. Contagiousness occurs only when TB becomes active, with symptoms like a persistent cough and other signs that patients can transmit bacteria through respiratory droplets. So, latent TB is not contagious. It’s also useful to remember that latent TB can reactivate later if the immune system weakens, which is why screening and, in some cases, treatment are important to prevent future active disease.