The Lower Respiratory Tract Has a Normal Microbiota

Question

The lower respiratory tract has a normal microbiota.

Accepted Answer

The lower respiratory tract, which includes the lungs and bronchi, normally has very few, if any, microorganisms present. This is due to mechanisms such as the cough reflex and the mucociliary escalator, which help to prevent colonization by bacteria or other pathogens. In contrast, the upper respiratory tract (including the nose, throat, and sinuses) does have a normal microbiota.