Fig. 1
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12931-017-0577-y/MediaObjects/12931_2017_577_Fig1_HTML.gif)
Cigarette smoke exposure protocol with Klebsiella (KB) intervention. Four groups of mice were exposed to either placebo + room air, KB + room air, placebo + cigarette smoke, or KB + cigarette smoke. Grey arrows, room air or cigarette smoke; white arrows, subcutaneous injection of placebo or KB. See methods for details