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Scientific prove of steam performance in hospital cleaning

  Most of us have ever seen that doctors may use boiled water to disinfect syringe needle, while steam can reach the temperature of more than 100℃, so can steam have wonderful cleaning and disinfection effect in hospital cleaning and disinfection?
 The following research will be a scientific validation of steam vapor's potency as a disinfectant for environmental surfaces in a hospital.
 The February 2009 issue of the peer-reviewed American Journal of Infection Control (AJIC)published a study demonstrating that a proprietary steam vapor system destroyed tested bacteria in 5 seconds.
 The saturated steam vapor disinfection system utilizing a proprietary water treatment module was shown to destroy within 5 seconds a diverse assortment of pathogenic organisms, including vancomycin-resistant Enterococcus faecalis (VRE), methicillin-resistant Staphylococcus aureus (MRSA), and C.  Diff.  This is dramatically faster than typical disinfection methods.
 The study, “Reduction in Infection Risk Through Treatment of Microbially Contaminated Surfaces With a Novel, Portable, Saturated Steam Vapor Disinfection System,” was conducted by Dr. Benjamin Tanner, president and scientific director of Antimicrobial Test Laboratories.  It demonstrated the capability of a steam vapor disinfection system to kill microorganisms, reduce surface-mediated infection risks and serve as an alternative to chemical disinfectants.
 According to Dr. Tanner:"Commercial steam vapor systems are designed to produce a targeted amount of high-quality, 'saturated' steam.  Saturated steam has relatively low moisture content, high temperature, and low particle size relative to steam produced by ordinary steam cleaners.  The heat delivered to surfaces by the steam is extraordinarily germicidal.  In fact, doctors and laboratories have relied on steam to disinfect critical equipment for decades.  A unique and very attractive attribute of steam as a germicide is that it is chemical-free.
 "All commercial steam vapor systems remove soil well, but some deliver heat more effectively to environmental surfaces, and therefore do a better job of killing pathogens that may reside there.  Well-designed systems deliver saturated steam through a cleaning head affixed with a textile component that traps the steam for maximum heat.  Once the steam has left a cleaning head, it expands and cools rapidly.  Therefore, the best tools for thermal disinfection hold the steam at the steam-surface interface."

   While Dr Peter Kite,a clinical scientist in UK using super heated steam, demonstrated the efficiency to kill the organisms causing the majority of Hospital Acquired Infections (HAI’s). These include Staphylococci (including MRSA), Enterococci (including VREs), Coliforms (including Salmonella, Campylobacter and other enteric infective agents), and also fungi, including Aspergillus and yeasts. Furthermore the most thermal resistant pathogens causing HAI’s are Clostridium Difficile (C–Diff) spores and these can be reduced substantially (50–90%) using this Super Heated Steam process. 
 In his reports, as steam temperature rises that contacts microbes, the time needed to kill bacteria decreases (thermal kinetics often have exponential impact)

 In his study, 18 hour broth cultures of Enterococci, E. Coli, CNS and Staph aureus were used. Each culture was placed in one of 6 sterile petrie dishes. Each plate, minus the control, was exposed to 1,2,3,4 or 5 seconds of superheated 220°C(248°F)  steam. After being exposed to the steam, all plates were cultured for 48 hours at 37°C(99°F ), then colony counts were performed.

Colony Count per ml

 Organism  Control  1 Sec  2 Secs  3 Secs  4 Secs  5 Secs
 Entercoccus  >1000  0  0  0  0  0
 E Coli  >1000  2  0  0  0  0
 CNS  >1000  3  0  0  0  0
 Staph aureus  >100<1000  2  0  0  0  0

 Heng'An brand industrial steam cleaner can generate 10 bar pressure high saturated steam. What's more, we can add function of superheated saturated steam for drier and hotter steam. If required, we can also customize steam vacuum  cleaner.

 Recommended indsutrial steam cleaning models:
 HF2160(220V 1ph, single steam gunjet), HF2190(380V 3ph, 2 steam gunjets)

1.Reduction in Infection Risks through Treatment of Microbially Contaminated Surfaces with a
Novel, Portable Steam Vapor Disinfection System. Benjamin D. Tanner. American Journal of
Infection Control. 2009. 37(1):20-27


Remarks: Dr. Benjamin Tanner is the principal of Antimicrobial Test Laboratories, an independent testing facility specializing in the research and development of antimicrobials, including disinfectants.Dr. Tanner holds a B.S. in Molecular Biology and a Ph.D. in Microbiology and Immunology from the University of Arizona, where he studied environmentally mediated disease transmission and assessed infection risks for workers.

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