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How Growth Ability of Multidrug-Resistant Escherichia coli Is Affected by Abiotic Stress Factors

Open Journal of Preventive Medicine 2014年第5期4卷 250-256页

作者： lucinda janete bessa Vania Filipa Dias Angelo Mendes Paula Martins-Costa Helena Ramos Paulo Martins da Costa CIIMAR—Interdisciplinary Center for Marine and Environmental Research University of PortoPortoPortugal ICBAS—Institute Abel Salazar for the Biomedical Sciences University of PortoPortoPortugal FCUP—Faculty of Sciences University of PortoPortoPortugal Servico de Microbiologia Centro Hospitalar do PortoHospital Geral de Santo AntonioPortoPortugal

The ability of multidrug-resistant Escherichia coli to adapt and grow in a wide range of different environmental conditions may be crucial to the global spread of antimicrobial resistance. The aim of this study was to evaluate the survival ability of 54 multidrug-resistant E. coli strains, isolated from three different biotopes (clinical setting, gull intestine, river water) when subjected to variations in pH (from 3 to 11) and salinity (from 0.5% to 6% of NaCl) and to nutrient deprivation. The growth of each isolate as well as of a reference strain was assessed during 168 h in every varying condition. Slight variations in the growth ability under some abiotic stress factors were recorded among the isolates from the different biotopes. Multidrug-resistant isolates from gull feces were found to be the more tolerant to environmental abiotic changes, while isolates from river water were the less tolerant. In addition, it was notorious that the carriage of antimicrobial resistance has a clear fitness cost in comparison with the susceptible (reference) strain, highlighting the necessity of reducing the selective pressure exerted by antibiotics. This study underlines the ecological hardness of multidrug-resistant E. coli isolates with a consequent ability to reach and colonize new host and environments.

关键词： Escherichia coli Multidrug Resistance Nutrient Deprivation pH Salinity

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Presence of Multidrug-Resistant E. coli, Enterococcusspp. and Salmonellaspp. in Lakes and Fountains of Porto, Portugal

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Journal of Water Resource and Protection 2013年第11期5卷 1117-1126页

作者： Carlos E. Flores Luís Loureiro lucinda J. bessa Paulo Martins da Costa 1ICBAS-Abel Salazar Biomedical Sciences Institute University of Porto Porto Portugal 2CIIMAR-Interdisciplinary Center for Marine and Environmental Research University of Porto Porto Portugal 1ICBAS-Abel Salazar Biomedical Sciences Institute University of Porto Porto Portugal 2Faculty of Sciences (FCUP) University of Porto Porto Portugal CIIMAR-Interdisciplinary Center for Marine and Environmental Research University of Porto Porto Portugal Tulane University School of Public Health and Tropical Medicine New Orleans USA

Urban lakes and fountains provide recreational activities that could facilitate the contact between humans, animals and biological agents. The objective of this work was to assess the water quality and safety of 17 lakes and 13 fountains in the city of Porto (Portugal), by detecting the presence of Escherichia coli, enterococci and Salmonella spp., and analyzing their antimicrobial resistance. (For more information,please refer to the pdf.)

关键词： Antimicrobial Resistance Enterococcus spp. Escherichia coli Salmonella spp. Fountains Lakes

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