Alberta Children’s Hospital, Calgary, Alberta
Osorno disinfected the distribution system of the then newly-built Alberta Children’s Hospital in August 2006, before the first patients were admitted in September 2006. Despite the high level of free chlorine (1 mg/l) in the water supplied by the City of Calgary, and a working UV disinfection system, high levels of Pseudomonas spp. were found at many faucets. Osorno flushed the complete piping system by adding 1 mg/l chlorine dioxide, and bacteria levels dropped to zero at all faucets. Chlorine dioxide is effective at combating bacteria, viruses and protozoans, including multiple drug resistant (MDR) microbes, commonly found in hospital settings.