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Major errors were observed for CNS-oxacillin and S. Microorganism-antibiotic combinations that gave very major errors were CNS-erythromycin, CNS-oxacillin, enterococci-teicoplanin, and enterococci-high-concentration gentamicin. aureus, from 90 to 100% for CNS, from 91 to 100% for enterococci, from 96 to 100% for S. Antimicrobial susceptibility testing showed category agreement from 94 to 100% for S. According to the NCCLS breakpoints, antimicrobial susceptibility testing with the VITEK 2 system gave 96% correct category agreement, 0.82% very major errors, 0.17% major errors, and 2.7% minor errors.
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More than 90% of gram-positive cocci were identified within 3 h. pneumoniae, 92.7% of Enterococcus faecalis, 91.3% of Staphylococcus haemolyticus, and 88% of Staphylococcus epidermidis but was least able to identify Enterococcus faecium (71.4% correct). The VITEK 2 system correctly identified to the species level (only one choice or after simple supplementary tests) 99% of S. The identification comparison methods were the API Staph for staphylococci and the API 20 Strep for streptococci and enterococci for antimicrobial susceptibility testing, the agar dilution method according to the procedure of the National Committee for Clinical Laboratory Standards (NCCLS) was used. agalactiae) and AST-P506 (for pneumococci) susceptibility cards.
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( n = 89), Streptococcus agalactiae ( n = 29), and Streptococcus pneumoniae ( n = 66) were examined with the ID-GPC identification card and with the AST-P515 (for staphylococci), AST-P516 (for enterococci and S. Clinical isolates of Staphylococcus aureus ( n = 100), coagulase-negative staphylococci (CNS) ( n = 100), Enterococcus spp. A study was conducted to evaluate the new VITEK 2 system (bioMérieux) for identification and antibiotic susceptibility testing of gram-positive cocci.