IL-17A and IL-23 levels were higher in BALF of COPD models compared to air-control mice (Figure S1). Then COPD mouse models were transbronchially inoculated with sterile agar beads (con-COPD group) or agar-entrapped P. aeruginosa (PA-COPD group). Here, IL17A is linked to chronic obstructive pulmonary disease.