Wet surface biofilms are a potential reservoir for multidrug-resistant Gram-negative organisms, including carbapenamase-producing Enterobacteriaceae (CPE). Recognition of environmental sources is important in reducing secondary patient transmission. We report the increased detection of bla-IMP-4+ CPE in environmental samples from floor drains in Burns Unit shower rooms, when collected following cleaning as compared to pre-cleaning. We propose that disruption of biofilms during cleaning may account for the increased detection of multi-resistant organisms. The results highlight the role of the wet environment as an under-recognised potential source of CPE transmission. Environmental screening focusing on pre-cleaning samples alone will likely under-estimate environmental contamination.

artikel gepubliceerd in Journal of Hospital Infection 2018 Oct 12. pii: S0195-6701(18)30537-1

auteurs: Shelanah A. FernandoThuy PhanChristine ParkerTina CaiThomas Gottlieb

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