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Cayô R, Streling AP, Nodari CS, Matos AP, de Paula Luz A, Dijkshoorn L, Pignatari ACC, Gales AC. Occurrence of IMP-1 in non-baumannii Acinetobacter clinical isolates from Brazil. J Med Microbiol 2018; 67:628-630. [PMID: 29624159 DOI: 10.1099/jmm.0.000732] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The aim of this study was to characterize the presence of carbapenemase-encoding genes in distinct species of Acinetobacter spp. isolated from Brazilian hospitals. Five carbapenem-resistant Acinetobacter spp. isolates (two Acinetobacter pittii, two Acinetobacter bereziniae and one Acinetobacter junii) recovered from two distinct hospitals between 2000 and 2016 were included in this study. All of the isolates harboured blaIMP-1, which was inserted into In86, a class 1 integron. Pulsed field gel eletrophoresis analysis showed that both A. pittii were identical, while the two A. berezinae isolates were considered to be clonally related. In this study, we demonstrated that mobile elements carrying carbapenemase-encoding genes such as In86 may persist for a long period, allowing their mobilization from A. baumannii to other Acinetobacter spp. that are usually susceptible to multiple antimicrobials.
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Affiliation(s)
- Rodrigo Cayô
- Universidade Federal de São Paulo - UNIFESP, Laboratório Alerta, Division of Infectious Diseases, Department of Internal Medicine, Escola Paulista de Medicina - EPM, São Paulo, Brazil
| | - Ana Paula Streling
- Universidade Federal de São Paulo - UNIFESP, Laboratório Alerta, Division of Infectious Diseases, Department of Internal Medicine, Escola Paulista de Medicina - EPM, São Paulo, Brazil
| | - Carolina Silva Nodari
- Universidade Federal de São Paulo - UNIFESP, Laboratório Alerta, Division of Infectious Diseases, Department of Internal Medicine, Escola Paulista de Medicina - EPM, São Paulo, Brazil
| | - Adriana Pereira Matos
- Universidade Federal de São Paulo - UNIFESP, Laboratório Alerta, Division of Infectious Diseases, Department of Internal Medicine, Escola Paulista de Medicina - EPM, São Paulo, Brazil
| | - Adryella de Paula Luz
- Universidade Federal de São Paulo - UNIFESP, Laboratório Especial de Microbiologia clínica - LEMC, Division of Infectious Diseases, Department of Internal Medicine, Escola Paulista de Medicina - EPM, São Paulo, Brazil
| | - Lenie Dijkshoorn
- Department of Infectious Diseases, Leiden University Medical Center, Leiden, The Netherlands
| | - Antonio Carlos Campos Pignatari
- Universidade Federal de São Paulo - UNIFESP, Laboratório Alerta, Division of Infectious Diseases, Department of Internal Medicine, Escola Paulista de Medicina - EPM, São Paulo, Brazil
- Universidade Federal de São Paulo - UNIFESP, Laboratório Especial de Microbiologia clínica - LEMC, Division of Infectious Diseases, Department of Internal Medicine, Escola Paulista de Medicina - EPM, São Paulo, Brazil
| | - Ana Cristina Gales
- Universidade Federal de São Paulo - UNIFESP, Laboratório Alerta, Division of Infectious Diseases, Department of Internal Medicine, Escola Paulista de Medicina - EPM, São Paulo, Brazil
- Universidade Federal de São Paulo - UNIFESP, Laboratório Especial de Microbiologia clínica - LEMC, Division of Infectious Diseases, Department of Internal Medicine, Escola Paulista de Medicina - EPM, São Paulo, Brazil
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2
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Dissemination of Multidrug-Resistant Proteus mirabilis Clones Carrying a Novel Integron-Borne blaIMP-1 in a Tertiary Hospital. Antimicrob Agents Chemother 2018; 62:AAC.01321-17. [PMID: 29158274 DOI: 10.1128/aac.01321-17] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Accepted: 11/03/2017] [Indexed: 11/20/2022] Open
Abstract
This study aimed to characterize multidrug-resistant Proteus mirabilis clones carrying a novel class 1 integron-borne blaIMP-1 In1359 was inserted into a large conjugative plasmid that also carried blaCTX-M-2 The production of carbapenemases in Enterobacteriaceae that are intrinsically resistant to polymyxins and tigecycline is very worrisome, representing a serious challenge to clinicians and infection control teams.
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3
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Integrons in Enterobacteriaceae: diversity, distribution and epidemiology. Int J Antimicrob Agents 2017; 51:167-176. [PMID: 29038087 DOI: 10.1016/j.ijantimicag.2017.10.004] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Revised: 09/29/2017] [Accepted: 10/07/2017] [Indexed: 01/03/2023]
Abstract
Integrons are versatile gene acquisition systems that allow efficient capturing of exogenous genes and ensure their expression. Various classes of integrons possessing a wide variety of gene cassettes are ubiquitously distributed in enteric bacteria worldwide. The epidemiology of integrons associated multidrug resistance in Enterobacteriaceae is rapidly evolving. In the past two decades, the incidence of integrons in enteric bacteria has increased drastically with evolution of multiple gene cassettes, novel gene arrangements and complex chromosomal integrons such as Salmonella genomic islands. This review focuses on the distribution, versatility, spread and global trends of integrons among important members of the Enterobacteriaceae, including Escherichia coli, Klebsiella, Shigella and Salmonella, which are known to cause infections globally. Such a comprehensive understanding of integron-associated antibiotic resistance, their role in the spread of such resistance traits and their clinical relevance especially with regard to each genus individually is paramount to contain the global spread of antibiotic resistance.
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4
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Escandón-Vargas K, Reyes S, Gutiérrez S, Villegas MV. The epidemiology of carbapenemases in Latin America and the Caribbean. Expert Rev Anti Infect Ther 2016; 15:277-297. [PMID: 27915487 DOI: 10.1080/14787210.2017.1268918] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
INTRODUCTION Enterobacteriaceae, Pseudomonas spp., and Acinetobacter spp. infections are major causes of morbidity and mortality, especially due to the emergence and spread of β-lactamases. Carbapenemases, which are β-lactamases with the capacity to hydrolyze or inactivate carbapenems, have become a serious concern as they have the largest hydrolytic spectrum and therefore limit the utility of most β-lactam antibiotics. Areas covered: Here, we present an update of the current status of carbapenemases in Latin America and the Caribbean. Expert commentary: The increased frequency of reports on carbapenemases in Latin America and the Caribbean shows that they have successfully spread and have even become endemic in some countries. Countries such as Brazil, Colombia, Argentina, and Mexico account for the majority of these reports. Early suspicion and detection along with implementation of antimicrobial stewardship programs in all healthcare settings are crucial for the control and prevention of carbapenemase-producing bacteria.
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Affiliation(s)
- Kevin Escandón-Vargas
- a Bacterial Resistance and Hospital Epidemiology Unit , International Center for Medical Research and Training (CIDEIM) , Cali , Colombia
| | - Sergio Reyes
- a Bacterial Resistance and Hospital Epidemiology Unit , International Center for Medical Research and Training (CIDEIM) , Cali , Colombia
| | - Sergio Gutiérrez
- a Bacterial Resistance and Hospital Epidemiology Unit , International Center for Medical Research and Training (CIDEIM) , Cali , Colombia
| | - María Virginia Villegas
- a Bacterial Resistance and Hospital Epidemiology Unit , International Center for Medical Research and Training (CIDEIM) , Cali , Colombia.,b Molecular Genetics and Antimicrobial Resistance Unit, International Center for Microbial Genomics , Universidad El Bosque , Bogotá , Colombia
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5
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Braun G, Cayô R, Barbosa A, Gales A. In-vivo emergence of polymyxin- B-resistant Klebsiella pneumoniae in patients with bloodstream infections. J Hosp Infect 2016; 94:338-340. [DOI: 10.1016/j.jhin.2016.09.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Accepted: 09/02/2016] [Indexed: 10/21/2022]
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6
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Sampaio JLM, Gales AC. Antimicrobial resistance in Enterobacteriaceae in Brazil: focus on β-lactams and polymyxins. Braz J Microbiol 2016; 47 Suppl 1:31-37. [PMID: 27825605 PMCID: PMC5156504 DOI: 10.1016/j.bjm.2016.10.002] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Revised: 10/07/2016] [Accepted: 10/07/2016] [Indexed: 12/22/2022] Open
Abstract
During the last 30 years there has been a dissemination of plasmid-mediated β-lactamases in Enterobacteriaceae in Brazil. Extended spectrum β-lactamases (ESBL) are widely disseminated in the hospital setting and are detected in a lower frequency in the community setting. Cefotaximases are the most frequently detected ESBL type and Klebsiella pneumoniae is the predominant species among ESBL producers. Klebsiella pneumoniae carbapenemase-producing Enterobacteriaceae became widely disseminated in Brazil during the last decade and KPC production is currently the most frequent resistance mechanism (96.2%) in carbapenem resistant K. pneumoniae. To date KPC-2 is the only variant reported in Brazil. Polymyxin B resistance in KPC-2-producing K. pneumoniae has come to an alarming rate of 27.1% in 2015 in São Paulo, the largest city in Brazil. New Delhi metallo-β-lactamase was detected in Brazil in 2013, has been reported in different Brazilian states but are not widely disseminated. Antimicrobial resistance in Enterobacteriaceae in Brazil is a very serious problem that needs urgent actions which includes both more strict adherence to infection control measures and more judicious use of antimicrobials.
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Affiliation(s)
- Jorge Luiz Mello Sampaio
- Universidade de São Paulo, Faculdade de Ciências Farmacêuticas, Departamento de Análises Clínicas e Toxicológicas, São Paulo, SP, Brazil; Fleury Medicina e Saúde, Seção de Microbiologia, São Paulo, SP, Brazil.
| | - Ana Cristina Gales
- Universidade Federal de São Paulo, Escola Paulista de Medicina, Departamento de Medicina Interna, São Paulo, Brazil.
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7
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Arjomandi OK, Hussein WM, Vella P, Yusof Y, Sidjabat HE, Schenk G, McGeary RP. Design, synthesis, and in vitro and biological evaluation of potent amino acid-derived thiol inhibitors of the metallo-β-lactamase IMP-1. Eur J Med Chem 2016; 114:318-27. [DOI: 10.1016/j.ejmech.2016.03.017] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 03/04/2016] [Accepted: 03/05/2016] [Indexed: 01/10/2023]
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8
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Identification of a new integron harboring bla(IMP-10) in carbapenem-resistant Acinetobacter baumannii clinical isolates. Antimicrob Agents Chemother 2015; 59:3687-9. [PMID: 25824226 DOI: 10.1128/aac.04991-14] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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9
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Lucena A, Dalla Costa LM, Nogueira KDS, Matos AP, Gales AC, Raboni SM. Comparison of phenotypic tests for the detection of metallo-beta-lactamases in clinical isolates of Pseudomonas aeruginosa. Enferm Infecc Microbiol Clin 2014; 32:625-30. [PMID: 24908495 DOI: 10.1016/j.eimc.2014.03.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Revised: 12/13/2013] [Accepted: 03/26/2014] [Indexed: 11/16/2022]
Abstract
Metallo-β-lactamase (MBL)-producing gram-negative bacteria are an increasing public health concern worldwide. Screening tests for the rapid and specific identification of these pathogens are essential, and should be included among routine diagnostics in laboratories. This study aimed to determine the MBL frequency among carbapenem-resistant Pseudomonas aeruginosa isolates, and to evaluate the accuracy of different tests in screening for MBL production. From January 2001 to December 2008, a total of 142 imipenem-non-susceptible P. aeruginosa strains were isolated from distinct clinical samples from hospitalized patients. These isolates were examined by PCR, MBL E-test, double-disk synergy test (DDST), and combined disk (CD) test. The minimal inhibitory concentration (MIC; μg/mL) was determined by agar dilution, and pulsed field gel electrophoresis (PFGE) was performed on all samples. Sequencing was performed to confirm and define the MBL variant and subtype. Using PCR and DNA sequence analysis, 93 strains were confirmed positive for MBLs, 91 strains for the blaSPM-1 gene, 1 strain for the blaIMP-1 gene, and 1 strain for the blaIMP-16 gene. PFGE displayed a clonal pattern. The sensitivities, specificities, positive and negative predictive values were evaluated for all tests. The DDST assay (CAZ-MPA) was the optimal method for screening MBL production in P. aeruginosa strains. However, the results of the CD assay (IMP/EDTA) showed close agreement with those of the DDST. In addition, the CD assay allowed a more objective interpretation and did not require the use of a toxic substance.
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Affiliation(s)
- Andréa Lucena
- Post-Graduate Program in Internal Medicine and Health Sciences, Universidade Federal do Paraná, Curitiba, Brazil
| | - Libera M Dalla Costa
- Bacteriology Laboratory, Hospital de Clínicas, Universidade Federal do Paraná, Curitiba, Brazil; Faculdades e Instituto de Pesquisa Pelé Pequeno Príncipe, Curitiba, Paraná, Brazil
| | - Keite da Silva Nogueira
- Bacteriology Laboratory, Hospital de Clínicas, Universidade Federal do Paraná, Curitiba, Brazil
| | - Adriana P Matos
- Laboratório Alerta, Universidade Federal de São Paulo, Brazil
| | - Ana C Gales
- Laboratório Alerta, Universidade Federal de São Paulo, Brazil; Laboratório Especial de Microbiologia Clínica, Division of Infectious Diseases, Universidade Federal de São Paulo, Brazil
| | - Sonia M Raboni
- Post-Graduate Program in Internal Medicine and Health Sciences, Universidade Federal do Paraná, Curitiba, Brazil.
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10
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Lima AMS, Melo MESD, Alves LC, Brayner FA, Lopes ACS. Investigation of class 1 integrons in Klebsiella pneumoniae clinical and microbiota isolates belonging to different phylogenetic groups in Recife, State of Pernambuco. Rev Soc Bras Med Trop 2014; 47:165-9. [DOI: 10.1590/0037-8682-0021-2014] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2014] [Accepted: 04/11/2014] [Indexed: 11/22/2022] Open
Affiliation(s)
- Alexsandra Maria Silva Lima
- Universidade Federal de Pernambuco, Brasil; Universidade Federal de Pernambuco, Brasil; Universidade Federal de Pernambuco, Brasil
| | | | - Luiz Carlos Alves
- Universidade Federal de Pernambuco, Brasil; Universidade Federal de Pernambuco, Brasil
| | - Fábio André Brayner
- Universidade Federal de Pernambuco, Brasil; Universidade Federal de Pernambuco, Brasil
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11
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Maya JJ, Ruiz SJ, Blanco VM, Gotuzzo E, Guzman-Blanco M, Labarca J, Salles M, Quinn JP, Villegas MV. Current status of carbapenemases in Latin America. Expert Rev Anti Infect Ther 2014; 11:657-67. [PMID: 23879607 DOI: 10.1586/14787210.2013.811924] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Enterobacteriaceae and non fermenting Gram-negative bacilli have become a threat to public health, in part due to their resistance to multiple antibiotic classes, which ultimately have led to an increase in morbidity and mortality. β-lactams are currently the mainstay for combating infections caused by these microorganisms, and β-lactamases are the major mechanism of resistance to this class of antibiotics. Within the β-lactamases, carbapenemases pose one of the gravest threats, as they compromise one of our most potent lines of defense, the carbapenems. Carbapenemases are being continuously identified worldwide; and in Latin America, numerous members of these enzymes have been reported. In this region, the high incidence of reports implies that carbapenemases have become a menace and that they are an issue that must be carefully studied and analyzed.
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Affiliation(s)
- Juan J Maya
- CIDEIM International Center for Medical Research and Training, Cali, Colombia
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12
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Bonelli RR, Moreira BM, Picão RC. Antimicrobial resistance among Enterobacteriaceae in South America: history, current dissemination status and associated socioeconomic factors. Drug Resist Updat 2014; 17:24-36. [PMID: 24618111 DOI: 10.1016/j.drup.2014.02.001] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
South America exhibits some of the higher rates of antimicrobial resistance in Enterobactericeae worldwide. This continent includes 12 independent countries with huge socioeconomic differences, where the ample access to antimicrobials, including counterfeit ones, coexists with ineffective health systems and sanitation problems, favoring the emergence and dissemination of resistant strains. This work presents a literature review concerning the evolution and current status of antimicrobial resistance threats found among Enterobacteriaceae in South America. Resistance to β-lactams, fluoroquinolones and aminoglycosides was emphasized along with description of key epidemiological studies that highlight the success of specific resistance determinants in different parts of the continent. In addition, a discussion regarding political and socioeconomic factors possibly related to the dissemination of antimicrobial resistant strains in clinical settings and at the community is presented. Finally, in order to assess the possible sources of resistant bacteria, we compile the current knowledge about the occurrence of antimicrobial resistance in isolates in South American' food, food-producing animals and off-hospitals environments. By addressing that intensive intercontinental commerce and tourism neutralizes the protective effect of geographic barriers, we provide arguments reinforcing that globally integrated efforts are needed to decelerate the emergence and dissemination of antimicrobial resistant strains.
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Affiliation(s)
- Raquel Regina Bonelli
- LIM Laboratório Integrado de Microbiologia, Instituto de Microbiologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Beatriz Meurer Moreira
- LIM Laboratório Integrado de Microbiologia, Instituto de Microbiologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Renata Cristina Picão
- LIM Laboratório Integrado de Microbiologia, Instituto de Microbiologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
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Nastro M, Monge R, Zintgraff J, Vaulet LG, Boutureira M, Famiglietti A, Rodriguez CH. First nosocomial outbreak of VIM-16-producing Serratia marcescens in Argentina. Clin Microbiol Infect 2012; 19:617-9. [PMID: 22862810 DOI: 10.1111/j.1469-0691.2012.03978.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Seven metallo-β-lactamase-positive isolates of Serratia marcescens were recovered from three patients hospitalized in a neonatal ward in an Argentinean hospital during the period July-September 2011. All the isolates were multidrug-resistant, they belonged to a single clone, and carried a blaVIM-16 -containing class I integron structure. This represents the first nosocomial outbreak of metallo-β-lactamase in Enterobacteriaceae in Argentina.
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Affiliation(s)
- M Nastro
- Laboratorio de Bacteriología, Departamento de Bioquímica Clínica, Hospital de Clínicas José de San Martín, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires-Sanatorio Sagrado Corazón, Buenos Aires, Argentina.
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14
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Synthesis and kinetic testing of new inhibitors for a metallo-β-lactamase from Klebsiella pneumonia and Pseudomonas aeruginosa. Eur J Med Chem 2011; 46:6075-82. [DOI: 10.1016/j.ejmech.2011.10.030] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2011] [Revised: 10/11/2011] [Accepted: 10/13/2011] [Indexed: 11/22/2022]
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15
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Antimicrobial activity of doripenem against Gram-negative pathogens: results from INVITA-A-DORI Brazilian Study. Braz J Infect Dis 2011; 15:513-20. [DOI: 10.1016/s1413-8670(11)70244-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2011] [Accepted: 11/04/2011] [Indexed: 11/24/2022] Open
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16
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The identification of new metallo-β-lactamase inhibitor leads from fragment-based screening. Bioorg Med Chem Lett 2011; 21:3282-5. [DOI: 10.1016/j.bmcl.2011.04.027] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2011] [Revised: 04/01/2011] [Accepted: 04/07/2011] [Indexed: 11/22/2022]
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17
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Kumar A, Chakraborti S, Joshi P, Chakrabarti P, Chakraborty R. A multiple antibiotic and serum resistant oligotrophic strain, Klebsiella pneumoniae MB45 having novel dfrA30, is sensitive to ZnO QDs. Ann Clin Microbiol Antimicrob 2011; 10:19. [PMID: 21595893 PMCID: PMC3118321 DOI: 10.1186/1476-0711-10-19] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2010] [Accepted: 05/19/2011] [Indexed: 11/22/2022] Open
Abstract
Background The aim of this study was to describe a novel trimethoprim resistance gene cassette, designated dfrA30, within a class 1 integron in a facultatively oligotrophic, multiple antibiotic and human serum resistant test strain, MB45, in a population of oligotrophic bacteria isolated from the river Mahananda; and to test the efficiency of surface bound acetate on zinc oxide quantum dots (ZnO QDs) as bactericidal agent on MB45. Methods Diluted Luria broth/Agar (10-3) media was used to cultivate the oligotrophic bacteria from water sample. Multiple antibiotic resistant bacteria were selected by employing replica plate method. A rapid assay was performed to determine the sensitivity/resistance of the test strain to human serum. Variable region of class 1 integron was cloned, sequenced and the expression of gene coding for antibiotic resistance was done in Escherichia coli JM 109. Identity of culture was determined by biochemical phenotyping and 16S rRNA gene sequence analyses. A phylogenetic tree was constructed based on representative trimethoprim resistance-mediating DfrA proteins retrieved from GenBank. Growth kinetic studies for the strain MB45 were performed in presence of varied concentrations of ZnO QDs. Results and conclusions The facultatively oligotrophic strain, MB45, resistant to human serum and ten antibiotics trimethoprim, cotrimoxazole, ampicillin, gentamycin, netilmicin, tobramycin, chloramphenicol, cefotaxime, kanamycin and streptomycin, has been identified as a new strain of Klebsiella pneumoniae. A novel dfr gene, designated as dfrA30, found integrated in class 1 integron was responsible for resistance to trimethoprim in Klebsiella pneumoniae strain MB45. The growth of wild strain MB45 was 100% arrested at 500 mg/L concentration of ZnO QDs. To our knowledge this is the first report on application of ZnO quantum dots to kill multiple antibiotics and serum resistant K. pneumoniae strain.
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Affiliation(s)
- Arvind Kumar
- Department of Biotechnology, University of North Bengal, Siliguri, West Bengal, India
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18
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CTX-M–producing Klebsiella spp. in a Brazilian hospital: what has changed in 6 years? Diagn Microbiol Infect Dis 2010; 68:186-9. [DOI: 10.1016/j.diagmicrobio.2010.05.013] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2009] [Revised: 05/01/2010] [Accepted: 05/17/2010] [Indexed: 11/24/2022]
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19
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Carvalho-Assef APD, Gomes MZR, Silva ARA, Werneck L, Rodrigues CAS, Souza MJ, Asensi MD. IMP-16 in Pseudomonas putida and Pseudomonas stutzeri: potential reservoirs of multidrug resistance. J Med Microbiol 2010; 59:1130-1131. [PMID: 20507999 DOI: 10.1099/jmm.0.020487-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Ana P D'A Carvalho-Assef
- Nosocomial Infection Research Laboratory, Oswaldo Cruz Foundation (FIOCRUZ), Rio de Janeiro, RJ, Brazil
| | - Marisa Z R Gomes
- Nosocomial Infection Research Laboratory, Oswaldo Cruz Foundation (FIOCRUZ), Rio de Janeiro, RJ, Brazil
| | - André R A Silva
- Hospital Infection Control Committee, Prontobaby Hospital da Criança, Rio de Janeiro, RJ, Brazil
| | - Lúcia Werneck
- Hospital Infection Control Committee, Prontobaby Hospital da Criança, Rio de Janeiro, RJ, Brazil
| | - Caio A S Rodrigues
- Microbiology Laboratory, Hospital dos Servidores do Estado, Rio de Janeiro, RJ, Brazil
| | - Maria J Souza
- Microbiology Laboratory, Hospital dos Servidores do Estado, Rio de Janeiro, RJ, Brazil
| | - Marise D Asensi
- Nosocomial Infection Research Laboratory, Oswaldo Cruz Foundation (FIOCRUZ), Rio de Janeiro, RJ, Brazil
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