Change inP. aeruginosaCFU/ml during PEx. A). Change in CFU from baseline sputum to admission at time of PEx. B). Change in CFU at EARLY time point (~day 4) of antibiotic treatment relative to admission. C). Change in CFU at the END of antibiotic treatment for PEx relative to admission. D). Change in CFU at follow-up clinic visit relative to admission. Black bars represent all P. aeruginosa isolates, grey bars only MUC, and white bars with black dots NON.