From the article:
In this study, Clarke gave mice antibiotics to kill most of the commensal bacteria in their gastrointestinal tracts. That, he found, reduced the ability of alveolar macrophages to kill K. pneumoniae, demonstrating that the commensal bacteria were somehow involved in this immune response.
This seems to me an argument against using antibiotics. (In my case, I am still mulling the idea of using antibiotics - seem to change my mind several times a day)
