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Revista médica de Chile

versão impressa ISSN 0034-9887

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PRADO J, Valeria; ESPARZA M, Mario; VIDAL A, Roberto  e  DURAN T, Claudia. Adherence to copper and stainless steel metal coupons of common nosocomial bacterial strains. Rev. méd. Chile [online]. 2013, vol.141, n.3, pp.291-297. ISSN 0034-9887.  http://dx.doi.org/10.4067/S0034-98872013000300002.

Background: Copper has a bactericidal activity against a series of bacterial strains. Aim: To measure resistance to bacterial adherence of copper (Cu) and stainless steel (SS) metal coupons. Material and Methods: Bacterial strains causing nosocomial infections in Chile were analyzed. Bacterial adherence was studied using apreviously described method based on a system of metal coupons that are immersed in culture media containing the bacteria ofinterest at room temperature. Results: Adherence to Cu and SS coupons was differentfor Methicillin-resistant Staphylococcus aureus (MRSA), Klebsiella pneumoniae and Acinetobacter baumannii strains. For these strains, no adherence to Cu coupons occurred during the 48 h observation period compared to a rapidly increasing adherence to SS coupons, with a final colony count of 1.00E + 07 cfu/mL. For two different Pseudomonas aeruginosa clinical strains, inhibition of adherence was not observed on Cu coupons, and colony counts were similar for Cu and SS using the standard inoculum (2-3 xlO7 cfu).Apartial decrease in adherence was observed for Cu but not for SS coupons, when a lower inoculum was used. Conclusions: Copper surfaces represent an interesting option to reduce bacterial contamination in the hospital environment due to its resistance to bacterial adhesión ofmost ofthe common nosocomial bacterial strains.

Palavras-chave : Acinetobacter baumannii; Bacterial antiadherent activity; Copper; Cross infection; MRSA; Klebsiella pneumonia; Pseudomonas aeruginosa.

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