“…The UAW are coming into the clinical and scientific focus as they were identified as a reservoir for initial and persistent airway colonization with pathogens like S. aureus and P. aeruginosa, that can be followed by LAW colonization, inflammation, and deterioration [ 25 , 28 ]. Our previous studies assessed the correlation of colonization and inflammation in different airway compartments [ 16 , 20 , 47 , 48 ]. Here, we assessed changes in pathogen colonization, proteases, antiproteases, and cells as well as symptoms after elective IV-antibiotic treatments primarily directed against P. aeruginosa .…”