1. **Lung Microbiome**: Traditionally, the lungs were consi…

1. **Lung Microbiome**: Traditionally, the lungs were considered sterile, but recent research has shown that they do host a small community of microorganisms. The lung microbiome is much less dense than the gut microbiome, and primarily consists of bacteria, with variations depending on factors like location, age, and health status. Changes or imbalances in the lung microbiome have been linked to respiratory conditions such as asthma, chronic obstructive pulmonary disease (COPD), and pneumonia.