Figure 1. The inherent challenge in morphotype selection for further testing and clinical report.

All of the colonies on this image are various morphotypes of P. aeruginosa, and each patient with persistent lung disease may harbor dozens of these morphotypes if carefully screened. Typically one or two are subjectively chosen for MIC testing and clinical report. Bacterial medium is a Congo red agar, image and background discussion kindly provided by H. Kulasekara and L. Hoffman.