Evaluation of the automated system Vitek2 for identification and antimicrobial susceptibility testing of Brazilian Gram-positive cocci strains
Braz. j. infect. dis
;
13(2): 107-110, Apr. 2009. tab
Article
in English
| LILACS
| ID: lil-538214
ABSTRACT
Automated instruments offer many advantages for clinical laboratories. Nevertheless, they can have problems identifying and determining susceptibilities of some pathogens. Vitek® 2 (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 coagulasenegative Staphylococcus (CoNS) and 49 Enterococcus and related species. Vitek® 2 correctly identified 79.8 percent (79/99) of the isolates. Oxacillin resistance was detected in 76 percent (19/25) of resistant S. epidermidis strains and in 88 percent (22/25) of other resistant CoNS species strains. Vancomycin resistance was detected in 100 percent (20/20) of resistant Enterococcus and related species strains. Vitek® 2 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.
Full text:
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Index:
LILACS (Americas)
Main subject:
Staphylococcus
/
Enterococcus
/
Automation, Laboratory
/
Anti-Bacterial Agents
Type of study:
Diagnostic study
/
Evaluation studies
/
Prognostic study
Limits:
Humans
Country/Region as subject:
South America
/
Brazil
Language:
English
Journal:
Braz. j. infect. dis
Journal subject:
Communicable Diseases
Year:
2009
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Foundation of Clinical Medical School of Porto Alegre/BR
/
Hospital Israelita Albert Einstein/BR
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