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Published on: September 16, 2022
Different efficacies of common disinfection methods against candida auris and other candida species
Leiwen Fu1, Tingting Le2, Zhihua Liu3
1Department of Epidemiology, School of Public Health, Southern Medical University, Guangzhou, China.
Background:
Candida auris can form long-lasting colonies in the hospital environment and on human skin. There is limited evidence regarding the efficacy of different methods and products for disinfecting hospitals and colonized patients to prevent the spread of C. auris.
Methods:
The minimum inhibitory concentration of three disinfectant products ("84" disinfectant, IodineTincture disinfectant, and quaternary ammonium) and 75% ethanol against C. auris and other Candida species were measured. A pig skin model was used to evaluate the efficacy of three hand hygiene products in killing pathogens. The killing effect of ultraviolet-C (253.7 nm) and the LK/CXD bed unit ozone disinfection machine on C. auris was also evaluated.
Results:
Thirty seconds of pig skin washing with bacteriostatic hand sanitizer followed by drying and 15 s of ethanol-based gel can completely eradicate the colonization of C. auris (3.00 log10 CFU). The antifungal activity of ultraviolet-C to C. auris inoculated on bed sheets was significantly reduced (P < 0.01) at a distance of 1 m. Candida glabrata and C. auris showed greater resistance to ozone than other Candida species. The ozone could completely eradicate C. auris (3.60 log10 CFU) on bed sheets at dosage of 300 mg/m3 for 40 min of exposure.
Conclusions:
We recommend extending the disinfection times of ultraviolet-C and ozone and emphasizing the effectiveness of washing skin with soap, drying skin, and then applying an ethanol-based gel to remove C. auris from skin.
Insights
Effective disinfection against Candida auris involves specific protocols. Washing skin with soap, drying, and applying an ethanol-based gel eradicates C. auris, while UV-C and ozone require extended exposure times for optimal results.
Area of Science:
- Infectious Diseases
- Microbiology
- Hospital Infection Control
Background:
- Candida auris forms persistent colonies on surfaces and skin, posing a significant hospital infection risk.
- Limited data exists on effective disinfection strategies for C. auris in healthcare settings and on patients.
Purpose of the Study:
- To evaluate the efficacy of various disinfectants and methods against Candida auris.
- To determine optimal disinfection protocols for C. auris on skin and environmental surfaces.
Main Methods:
- Minimum inhibitory concentrations of disinfectants (including "84" disinfectant, IodineTincture, quaternary ammonium, and 75% ethanol) against Candida species were determined.
- A pig skin model assessed hand hygiene product efficacy; UV-C and ozone disinfection effects on C. auris were also evaluated.
Main Results:
- Complete eradication of C. auris on pig skin was achieved with 30s soap wash, drying, and 15s ethanol-based gel application.
- UV-C efficacy against C. auris on bed sheets decreased significantly at 1m distance.
- Ozone effectively eradicated C. auris on bed sheets at 300 mg/m³ for 40 min, though C. auris showed higher ozone resistance.
Conclusions:
- Extended disinfection times for UV-C and ozone are recommended.
- Emphasize skin disinfection using soap, drying, and ethanol-based gel for C. auris removal.
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