Fig. 3

Proportional abundance of bacterial community members in intubated subjects and healthy controls. Each point represents an OTU; the samples from which the OTUs were identified are arrayed along the horizontal axis, including both upper and lower respiratory tract sites; the proportional abundance of each OTU in the sample from which it was identified is indicated by its position along the vertical axis. All OTUs that accounted for >200 reads across all samples are included; OTUs from healthy controls are colored red; OTUs from intubated subjects are colored blue. Asterisks indicate samples with concurrent documentation of suspected pneumonia by the critical care attending physician