FIG. 1.

Comparison of log₁₀ numbers of viable CFU from biofilm-coated polyethylene disks. The second bar from the right represents data from experiments in which ultrasound (US) at 300 mW/cm² was pulsed in a 1:3 duty cycle, producing a time-averaged intensity of 100 mW/cm². Likewise, the far right bar represents experiments in which ultrasound at 600 mW/cm² was pulsed in a 1:6 duty cycle, also producing a time-averaged intensity of 100 mW/cm². The asterisks indicate sets of data that are significantly different (P < 0.05) from data for implants treated with gentamicin only.