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Candida auris Dry Surface Biofilm (DSB) for Disinfectant Efficacy Testing

School of Pharmacy and Pharmaceutical Sciences, Cardiff University, Cardiff CF10 3NB, UK
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Materials 2019, 12(1), 18; https://doi.org/10.3390/ma12010018
Received: 20 November 2018 / Revised: 12 December 2018 / Accepted: 14 December 2018 / Published: 21 December 2018
(This article belongs to the Special Issue Microbial Biofilms in Healthcare: Formation, Prevention and Treatment)
Candida auris is an emerging pathogen that needs to be controlled effectively due to its association with a high mortality rate. The presence of biofilms on dry surfaces has been shown to be widespread in healthcare settings. We produced a C. auris dry surface biofilm (DSB) on stainless steel surfaces following sequential hydration and desiccation cycles for 12 days. The ASTM2967-15 was used to measure the reduction in viability of 12 commercially wipe-based disinfectants and sodium hypochlorite (1000 ppm) against C. auris DSB. We also evaluated C. auris transferability and biofilm regrowth post-treatment. A peracetic acid (3500 ppm) product and two chlorine-based products (1000 ppm available chlorine) were successful in reducing C. auris viability and delaying DSB regrowth. However, 50% of the products tested failed to decrease C. auris viability, 58% failed to prevent its transferability, and 75% did not delay biofilm regrowth. Using three different parameters to measure product efficacy provided a practical evaluation of product effectiveness against C. auris DSB. Although log10 reduction in viability is traditionally measured, transferability is an important factor to consider from an infection control and prevention point of view as it allows for determination of whether the surface is safe to touch by patients and hospital staff post-treatment. View Full-Text
Keywords: Candida auris; dry-biofilm; disinfection; peracetic acid; sodium hypochlorite; chlorine dioxide; sodium dichloroisocyanurate; transferability; regrowth Candida auris; dry-biofilm; disinfection; peracetic acid; sodium hypochlorite; chlorine dioxide; sodium dichloroisocyanurate; transferability; regrowth
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Ledwoch, K.; Maillard, J.-Y. Candida auris Dry Surface Biofilm (DSB) for Disinfectant Efficacy Testing. Materials 2019, 12, 18.

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