When the conventional methods described above failed to
terminate the outbreak, environmental decontamination with
VHP (Steris Ltd, Basingstoke, UK) was introduced for decontaminating
operating theatres and patients’ rooms. VHP is
a mobile system for disinfection and sterilization of rooms at
low temperatures (20e45 C). A prevalidated cycle was performed
in both ICUs, with an application of 250 ppm for 90 min
followed by 400 ppm for 30 min.