1887

Abstract

Globally, healthcare-associated infections (HAI) are the most frequent adverse outcome in healthcare delivery. Although bacterial biofilms contribute significantly to the incidence of HAI, few studies have investigated the efficacy of common disinfectants against dry-surface biofilms (DSB). The objective of this study was to evaluate the bactericidal efficacy of seven Environmental Protection Agency (EPA)-registered liquid disinfectants against DSB of and . We hypothesized that overall, there will be significant differences among the bactericidal efficacies of tested disinfectants by product type and active ingredient class. We also hypothesized that depending on the species, higher bactericidal efficacies against DSB will be exhibited after 24 h of dehydration compared to 72 h. Wet-surface biofilms of and were grown following EPA-MLB-SOP-MB-19 and dehydrated for 24 and 72 h to establish DSB. Seven EPA-registered disinfectants were tested against dehydrated DSB following EPA-MLB-SOP-MB-20. Overall, quaternary ammonium plus alcohol, sodium dichloro-s-triazinetrione and hydrogen peroxide products were more efficacious against DSB than quaternary ammoniums for both tested species. While there was no significant difference in the log reductions between 24 and 72 h . biofilms, significantly higher log reductions were observed when products were challenged with 24 h . DSB compared to 72 h . DSB. Species type, active ingredient class and dry time significantly impact disinfectant efficacy against DSB of or .

Funding
This study was supported by the:
  • Diversey Inc., Fort Mill, SC, USA
    • Principle Award Recipient: HaleyF. Oliver
  • This is an open-access article distributed under the terms of the Creative Commons Attribution NonCommercial License.
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2022-03-11
2024-07-20
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