Evaluation of the automated system Vitek2 for identification and antimicrobial susceptibility testing of Brazilian Gram-positive cocci strains. 2009

Pedro Alves d'Azevedo, and Itacy Siquiera, and Juliana Gugel, and Ana Lúcia Souza Antunes, and Carina Secchi, and Jacyr Pasternak, and Marinês Dalla Vale Martino
Department of Microbiology and Parasitology, Clinical Medical School of Porto Alegre, Rua Sarmento Leite 245/204, Porto Alegre, RS, Brazil. pedroaze@ufcspa.edu.br

Automated instruments offer many advantages for clinical laboratories. Nevertheless, they can have problems identifying and determining susceptibilities of some pathogens. Vitek2 (bioMérieux) is an automated system that was recently introduced to Brazil. We evaluated the performance of this equipment for Brazilian isolates that had been characterized using reference identification and antimicrobial susceptibility testing methods. Ninety-nine strains of Gram-positive cocci from a local reference center collection were analyzed, consisting of 50 coagulase-negative Staphylococcus (CoNS) and 49 Enterococcus and related species. Vitek2 correctly identified 79.8% (79/99) of the isolates. Oxacillin resistance was detected in 76% (19/25) of resistant S. epidermidis strains and in 88% (22/25) of other resistant CoNS species strains. Vancomycin resistance was detected in 100% (20/20) of resistant Enterococcus and related species strains. Vitek2 performed very well for the identification of S. epidermidis and non-epidermidis staphylococci, and for the detection of vancomycin resistance in Enterococcus and related species. However, the system needs improvement in order to provide reliable results for the characterization of some CoNS species, identification of Enterococcus and related species and for detecting oxacillin resistance in CoNS.

UI MeSH Term Description Entries
D008826 Microbial Sensitivity Tests Any tests that demonstrate the relative efficacy of different chemotherapeutic agents against specific microorganisms (i.e., bacteria, fungi, viruses). Bacterial Sensitivity Tests,Drug Sensitivity Assay, Microbial,Minimum Inhibitory Concentration,Antibacterial Susceptibility Breakpoint Determination,Antibiogram,Antimicrobial Susceptibility Breakpoint Determination,Bacterial Sensitivity Test,Breakpoint Determination, Antibacterial Susceptibility,Breakpoint Determination, Antimicrobial Susceptibility,Fungal Drug Sensitivity Tests,Fungus Drug Sensitivity Tests,Sensitivity Test, Bacterial,Sensitivity Tests, Bacterial,Test, Bacterial Sensitivity,Tests, Bacterial Sensitivity,Viral Drug Sensitivity Tests,Virus Drug Sensitivity Tests,Antibiograms,Concentration, Minimum Inhibitory,Concentrations, Minimum Inhibitory,Inhibitory Concentration, Minimum,Inhibitory Concentrations, Minimum,Microbial Sensitivity Test,Minimum Inhibitory Concentrations,Sensitivity Test, Microbial,Sensitivity Tests, Microbial,Test, Microbial Sensitivity,Tests, Microbial Sensitivity
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000900 Anti-Bacterial Agents Substances that inhibit the growth or reproduction of BACTERIA. Anti-Bacterial Agent,Anti-Bacterial Compound,Anti-Mycobacterial Agent,Antibacterial Agent,Antibiotics,Antimycobacterial Agent,Bacteriocidal Agent,Bacteriocide,Anti-Bacterial Compounds,Anti-Mycobacterial Agents,Antibacterial Agents,Antibiotic,Antimycobacterial Agents,Bacteriocidal Agents,Bacteriocides,Agent, Anti-Bacterial,Agent, Anti-Mycobacterial,Agent, Antibacterial,Agent, Antimycobacterial,Agent, Bacteriocidal,Agents, Anti-Bacterial,Agents, Anti-Mycobacterial,Agents, Antibacterial,Agents, Antimycobacterial,Agents, Bacteriocidal,Anti Bacterial Agent,Anti Bacterial Agents,Anti Bacterial Compound,Anti Bacterial Compounds,Anti Mycobacterial Agent,Anti Mycobacterial Agents,Compound, Anti-Bacterial,Compounds, Anti-Bacterial
D013210 Staphylococcus A genus of gram-positive, facultatively anaerobic, coccoid bacteria. Its organisms occur singly, in pairs, and in tetrads and characteristically divide in more than one plane to form irregular clusters. Natural populations of Staphylococcus are found on the skin and mucous membranes of warm-blooded animals. Some species are opportunistic pathogens of humans and animals.
D015203 Reproducibility of Results The statistical reproducibility of measurements (often in a clinical context), including the testing of instrumentation or techniques to obtain reproducible results. The concept includes reproducibility of physiological measurements, which may be used to develop rules to assess probability or prognosis, or response to a stimulus; reproducibility of occurrence of a condition; and reproducibility of experimental results. Reliability and Validity,Reliability of Result,Reproducibility Of Result,Reproducibility of Finding,Validity of Result,Validity of Results,Face Validity,Reliability (Epidemiology),Reliability of Results,Reproducibility of Findings,Test-Retest Reliability,Validity (Epidemiology),Finding Reproducibilities,Finding Reproducibility,Of Result, Reproducibility,Of Results, Reproducibility,Reliabilities, Test-Retest,Reliability, Test-Retest,Result Reliabilities,Result Reliability,Result Validities,Result Validity,Result, Reproducibility Of,Results, Reproducibility Of,Test Retest Reliability,Validity and Reliability,Validity, Face
D016983 Enterococcus A genus of gram-positive, coccoid bacteria consisting of organisms causing variable hemolysis that are normal flora of the intestinal tract. Previously thought to be a member of the genus STREPTOCOCCUS, it is now recognized as a separate genus.
D057205 Automation, Laboratory Controlled operations of analytic or diagnostic processes, or systems by mechanical or electronic devices. Laboratory Automation

Related Publications

Pedro Alves d'Azevedo, and Itacy Siquiera, and Juliana Gugel, and Ana Lúcia Souza Antunes, and Carina Secchi, and Jacyr Pasternak, and Marinês Dalla Vale Martino
May 2002, Journal of clinical microbiology,
Pedro Alves d'Azevedo, and Itacy Siquiera, and Juliana Gugel, and Ana Lúcia Souza Antunes, and Carina Secchi, and Jacyr Pasternak, and Marinês Dalla Vale Martino
June 1984, European journal of clinical microbiology,
Pedro Alves d'Azevedo, and Itacy Siquiera, and Juliana Gugel, and Ana Lúcia Souza Antunes, and Carina Secchi, and Jacyr Pasternak, and Marinês Dalla Vale Martino
January 2022, Current research in microbial sciences,
Pedro Alves d'Azevedo, and Itacy Siquiera, and Juliana Gugel, and Ana Lúcia Souza Antunes, and Carina Secchi, and Jacyr Pasternak, and Marinês Dalla Vale Martino
July 2010, Clinical microbiology and infection : the official publication of the European Society of Clinical Microbiology and Infectious Diseases,
Pedro Alves d'Azevedo, and Itacy Siquiera, and Juliana Gugel, and Ana Lúcia Souza Antunes, and Carina Secchi, and Jacyr Pasternak, and Marinês Dalla Vale Martino
July 1995, Journal of clinical microbiology,
Pedro Alves d'Azevedo, and Itacy Siquiera, and Juliana Gugel, and Ana Lúcia Souza Antunes, and Carina Secchi, and Jacyr Pasternak, and Marinês Dalla Vale Martino
March 2007, Journal of clinical microbiology,
Pedro Alves d'Azevedo, and Itacy Siquiera, and Juliana Gugel, and Ana Lúcia Souza Antunes, and Carina Secchi, and Jacyr Pasternak, and Marinês Dalla Vale Martino
January 2010, European journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology,
Pedro Alves d'Azevedo, and Itacy Siquiera, and Juliana Gugel, and Ana Lúcia Souza Antunes, and Carina Secchi, and Jacyr Pasternak, and Marinês Dalla Vale Martino
August 2001, Diagnostic microbiology and infectious disease,
Pedro Alves d'Azevedo, and Itacy Siquiera, and Juliana Gugel, and Ana Lúcia Souza Antunes, and Carina Secchi, and Jacyr Pasternak, and Marinês Dalla Vale Martino
December 1998, European journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology,
Pedro Alves d'Azevedo, and Itacy Siquiera, and Juliana Gugel, and Ana Lúcia Souza Antunes, and Carina Secchi, and Jacyr Pasternak, and Marinês Dalla Vale Martino
January 2014, Revista da Sociedade Brasileira de Medicina Tropical,
Copied contents to your clipboard!