showed that an H2O2 vapour decontamination system, using a gas generator that evaporates 30% liquid H2O2 via a distribution system with high kinetic energy and even distribution throughout the room, was highly effective in eradicating environmental methicillinresistant Staphylococcus aureus (MRSA). Before decontamination, 72% of room swabs yielded MRSA; afterwards, only one of 85 samples (1.2%) yielded MRSA. The decontamination cycles lasted for 5 h in total and gave a concentration of 500 ppm for 40 min