Which situation increases TB transmission risk?

Which situation increases TB transmission risk?

• A. Prolonged close contact in poorly ventilated spaces
• B. Sharing food with an infected person
• C. Brief conversations outdoors
• D. Contact with animals

Answer: (A)

TB spreads through airborne droplets, so the risk rises when someone with infectious pulmonary TB shares air with others for a long period in a space with poor ventilation. Prolonged close contact in such environments allows droplet nuclei to accumulate and be inhaled, increasing the chance of transmission. Sharing food doesn’t reliably transmit TB because the bacteria aren’t typically spread via utensils or bites. Brief conversations outdoors have low risk since wind and open air disperse particles, reducing exposure. Contact with animals isn’t the common route for human TB transmission, except for rare zoonotic forms, which is not the typical scenario.

TB spreads through airborne droplets, so the risk rises when someone with infectious pulmonary TB shares air with others for a long period in a space with poor ventilation. Prolonged close contact in such environments allows droplet nuclei to accumulate and be inhaled, increasing the chance of transmission. Sharing food doesn’t reliably transmit TB because the bacteria aren’t typically spread via utensils or bites. Brief conversations outdoors have low risk since wind and open air disperse particles, reducing exposure. Contact with animals isn’t the common route for human TB transmission, except for rare zoonotic forms, which is not the typical scenario.