This was a head-to-head comparison of two hydrogen-peroxide-based room decontamination
To compare the efficacy, efficiency and safety of hydrogen peroxide vapour (HPV; Clarus
R, Bioquell, Andover, UK) and aerosolized hydrogen peroxide (aHP; SR2, Sterinis, now
supplied as Glosair, Advanced Sterilization Products (ASP), Johnson & Johnson Medical
Ltd, Wokingham, UK) room disinfection systems.
Efficacy was tested using 4- and 6-log Geobacillus stearothermophilus biological indicators (BIs) and in-house prepared test discs containing approximately
106 meticillin-resistant Staphylococcus aureus (MRSA), Clostridium difficile and Acinetobacter baumannii. Safety was assessed by detecting leakage of hydrogen peroxide using a hand-held
detector. Efficiency was assessed by measuring the level of hydrogen peroxide using
a hand-held sensor at three locations inside the room, 2 h after the start of the
HPV generally achieved a 6-log reduction, whereas aHP generally achieved less than
a 4-log reduction on the BIs and in-house prepared test discs. Uneven distribution
was evident for the aHP system but not the HPV system. Hydrogen peroxide leakage during
aHP cycles with the door unsealed, as per the manufacturer’s operating manual, exceeded
the short-term exposure limit (2 ppm) for more than 2 h. When the door was sealed
with tape, as per the HPV system, hydrogen peroxide leakage was <1 ppm for both systems.
The mean concentration of hydrogen peroxide in the room 2 h after the cycle started
was 1.3 [standard deviation (SD) 0.4] ppm and 2.8 (SD 0.8) ppm for the four HPV and
aHP cycles, respectively. None of the readings were <2 ppm for the aHP cycles.
The HPV system was safer, faster and more effective for biological inactivation.