Which route of transmission is most associated with tuberculosis?

• A. Airborne transmission
• B. Contact transmission
• C. Bloodborne transmission
• D. Fecal-oral transmission

Answer: (A)

Tuberculosis mainly spreads through the air. When someone with active pulmonary TB coughs, sneezes, or talks, they release tiny droplet nuclei containing the bacteria. These particles are small enough to stay suspended in the air for long periods and can be inhaled by others, especially in enclosed spaces with limited ventilation. That airborne route is why TB control emphasizes airborne precautions like proper ventilation and respirators.

The other routes don’t fit TB well: contact transmission requires direct contact with contaminated skin or surfaces, which isn’t the typical mode for TB. Bloodborne transmission involves infected blood, and fecal-oral transmission involves ingestion of material from the feces—neither is how TB generally spreads.