Bacterial Composition of Tracheal Aspirate Samples for Each Patient by Day of Collection.

Bacterial composition of each sample is displayed in the bar graphs as a percent of total sequences in the sample. Each species can be identified by color according to the legend. Days of antibiotic administration are displayed on the top of each graph with the solid lines depictingthe duration of specific antibiotic use as noted on right side of the figure. Results of clinically obtained cultures are displayed in the middle section of each graph with an “x” depicting the day they were obtained. All cultures were from tracheal aspirates unless otherwise noted. (NG: no growth, MURF: mixed upper respiratory flora, E. cloacae: Enterobacter cloacae, K. pneumoniae: Klebsiella pneumonia, MSSA: methicillin sensitive Staphylococcal aureus, P. aeruginosa: Pseudomonas aeruginosa.