The effects of low-frequency ultrasound (35 kHz) on methicillin-resistant Staphylococcus aureus (MRSA) in vitro.

Scanning electron microscopy study results support an in vitro bactericidal effect of low-frequency ultrasound (LFU) delivered at 40 kHz on bacteria, including methicillin-resistant Staphylococcus aureus (MRSA). The purpose of this in vitro study was to determine the effects of LFU delivered at 35 kHz on bacterial viability, cell wall structure, and colony characteristics, including antibiotic resistance on vegetative forms of MRSA. A known MRSA isolate from a patient lower extremity wound was subcultured, plated, and grown on sheep blood agar (SBA).