North Carolina CNA Written Practice Exam

How is tuberculosis (TB) primarily transmitted?

1. By touching infected surfaces

2. Through the air when an infected person talks, coughs, laughs, sings, or sneezes

3. By sharing utensils

4. Through contaminated food or drink

The correct answer is: Through the air when an infected person talks, coughs, laughs, sings, or sneezes

Tuberculosis (TB) is primarily transmitted through the air when an infected person talks, coughs, laughs, sings, or sneezes. When someone with active TB disease of the lungs or throat expels tiny droplets into the air, these droplets can be inhaled by individuals nearby, leading to potential infection. This airborne transmission is a significant reason why TB can spread rapidly in enclosed spaces or crowded environments where ventilation may be poor. The other methods mentioned, such as touching infected surfaces or sharing utensils, do not typically lead to TB transmission, as the bacteria that cause TB do not survive long outside the human body and are not spread through contact or shared items. Additionally, while food and drink can transmit certain infections, TB is not one of them, as it requires the specific airborne route for significant transmission. Understanding these routes helps in implementing appropriate public health measures to control and prevent the spread of TB.