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          Abstract

          Abstract In this review, we explore some aspects of Pseudomonas aeruginosa virulence factors that are related to disease development in healthy organisms and resistance to antibiotics. This pathogen is one of the most clinically and epidemiologically important bacteria in Brazil, being the major cause of opportunistic infections. Among the virulence factors, biofilm formation acting of manner different in the organism. Furthermore, we review several P. aeruginosa genes that act in antimicrobial resistance, such as β-lactamases against β-lactamers. The resistance to pied-lactamases in P. aeruginosa is associated to resistance to the broad-spectrum cephalosporin. On the other hand, there is a group of synthetic broad-spectrum antibiotics acting on DNA synthesis is the quinolones that destroy the microorganism. We also explore the occurence of super bacterium: P. aerufinosa carrying genes blaKPC and blaNDM, which are associated with patient death above the average of other bacterial infections in hospitals. Those genes encode carbapenemases that can potentially hydrolyse all β-lactam antibiotics

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          Multiple mechanisms of antimicrobial resistance in Pseudomonas aeruginosa: our worst nightmare?

          Pseudomonas aeruginosa carries multiresistance plasmids less often than does Klebsiella pneumoniae, develops mutational resistance to cephalosporins less readily than Enterobacter species, and has less inherent resistance than Stenotrophomonas maltophilia. What nevertheless makes P. aeruginosa uniquely problematic is a combination of the following: the species' inherent resistance to many drug classes; its ability to acquire resistance, via mutations, to all relevant treatments; its high and increasing rates of resistance locally; and its frequent role in serious infections. A few isolates of P. aeruginosa are resistant to all reliable antibiotics, and this problem seems likely to grow with the emergence of integrins that carry gene cassettes encoding both carbapenemases and amikacin acetyltransferases.
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            Healthcare-associated infections, medical devices and biofilms: risk, tolerance and control.

            Biofilms are of great importance in infection control and healthcare-associated infections owing to their inherent tolerance and 'resistance' to antimicrobial therapies. Biofilms have been shown to develop on medical device surfaces, and dispersal of single and clustered cells implies a significant risk of microbial dissemination within the host and increased risk of infection. Although routine microbiological testing assists with the diagnosis of a clinical infection, there is no 'gold standard' available to reveal the presence of microbial biofilm from samples collected within clinical settings. Furthermore, such limiting factors as viable but non-culturable micro-organisms and small-colony variants often prevent successful detection. In order to increase the chances of detection and provide a more accurate diagnosis, a combination of microbiological culture techniques and molecular methods should be employed. Measures such as antimicrobial coating and surface alterations of medical devices provide promising opportunities in the prevention of biofilm formation on medical devices.
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              Role of efflux pumps in the antibiotic resistance of bacteria embedded in a biofilm

              Biofilms are complex microbial associations anchored to abiotic or biotic surfaces, embedded in extracellular matrix produced by the biofilms themselves where they interact with each other and the environment. One of the main properties of biofilms is their capacity to be more resistant to antimicrobial agents than planktonic cells. Efflux pumps have been reported as one of the mechanisms responsible for the antimicrobial resistance in biofilm structures. Evidence of the role of efflux pump in biofilm resistance has been found in several microorganisms such as Pseudomonas aeruginosa, Escherichia coli and Candida albicans. However, in spite of the studies on the importance of efflux pumps in biofilm growth and about their relevance in antimicrobial resistance forming biofilm, the exact role of these efflux systems has not been determined as yet.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                babt
                Brazilian Archives of Biology and Technology
                Braz. arch. biol. technol.
                Instituto de Tecnologia do Paraná - Tecpar (Curitiba, PR, Brazil )
                1516-8913
                1678-4324
                2019
                : 62
                : 0
                : e19180503
                Affiliations
                [3] Sobral Ceará orgnameUniversidade Federal do Ceará orgdiv1Laboratory de Microbiology Brazil
                [1] Fortaleza Ceará orgnameUniversidade Federal do Ceará orgdiv1Department of Biochemistry and Molecular Biology Brazil
                [4] Sobral Ceará orgnameUNINTA Brazil
                [5] Sobral Ceará orgnameFederal Institute of Education, Science and Technology orgdiv1Laboratory of Environmental Biology and Microbiology Brazil
                [2] Campinas São Paulo orgnameUniversidade Estadual de Campinas orgdiv1Institute of Biology orgdiv2Laboratory of Genome e BioEnergy-LGE Brazil
                Article
                S1516-89132019000100902
                10.1590/1678-4324-2019180503
                81babfa8-73d3-4af7-a4ba-e751f364c7ad

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 16 May 2019
                : 18 September 2018
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 60, Pages: 0
                Product

                SciELO Brazil

                Categories
                Review - Human and Animal Health

                Pseudomonas aeruginosa,virulence factors,antimicrobial activities,biofilms,β-lactamase

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