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Background  An increased proportion of Gram-negative bacteria have recently been reported among etiologic agents of infection. In Poland,  Acinetobacter baumannii  is a big problem for hospitals, especially intensive care units. Touch surfaces made from materials with antimicrobial properties, especially copper alloys, are recommended as a supplementary method of increasing biological safety in the hospital environment.    Aim of the study  The objective of this study is to determine the susceptibility to selected copper alloys of three clinical  Acinetobacter baumannii  strains, one  Acinetobacter lwoffi  and an  A. pittii  strain isolated from the hospital environment.    Material and method  The modification of the Japanese Standard, which the ISO 22196:2011 norm was used for testing antimicrobial properties of CuZn37, CuSn6 and CuNi18Zn20 and Cu-ETP and stainless steel as positive and negative control, respectively.    Results  The highest cidal efficiency, expressed as both time and the degree of reduction of the initial suspension density, against all of the tested  Acinetobacter  strains was found for ETP copper. But, the results of our study also confirmed effective activity (bacteriocidal or bacteriostatic) of copper alloys selected for the study, contrary to the stainless steel. The reduction in bacterial suspension density is significantly different depending on the strain and copper alloy composition.    Conslusions  The results of our study confirmed the effective antibacterial activity of copper and its selected alloys against clinical  Acinetobacter baumannii  and  Acinetobacter lwoffii  strains, and  Acinetobacter pittii  strain isolated from the hospital environment.

Antimicrobial effect of copper alloys on Acinetobacter species isolated from infections and hospital environment