Researchers are exploring the use of pulmonary microbiota and host gene expression to develop a diagnostic model that can distinguish between colonization and pneumonia. Studies are investigating the role of microbiota in various respiratory conditions, including infections and cancer, with some focusing on the potential of microbiome profiling for early detection and personalized treatment. The development of diagnostic models using host response and respiratory microbiome data from tests such as metatranscriptome analysis of bronchoalveolar lavage fluid is also being researched.