PMID: 9552711Jan 1, 1997Paper

Quality assessment of glycopeptide susceptibility tests: a European collaborative study. European Glycopeptide Resistance Group

International Journal of Antimicrobial Agents
D F Brown, P Courvalin

Abstract

The ability of seventy clinical laboratories in nine European countries to detect glycopeptide resistance in Gram-positive bacteria was investigated. Results of routine tests were compared with those on the same strains by a reference method in national co-ordinating laboratories. In addition, control strains were tested by some of the participants. Errors in reporting susceptibility of Staphylococcus aureus to teicoplanin and vancomycin and coagulase-negative staphylococci to vancomycin were < 1%. With coagulase-negative staphylococci however, 44 (3.4%) teicoplanin susceptible isolates were reported intermediate and six (0.4%) resistant; 18 (58.1%) of 31 teicoplanin intermediate isolates were reported susceptible and five (16.1%) resistant; and six of nine teicoplanin resistant isolates were reported susceptible and two intermediate. All seven isolates of enterococci intermediate to vancomycin were reported susceptible. Distribution of a known vancomycin intermediate strain of E. gallinarum indicated problems with vancomycin susceptibility testing (44.4% reported susceptible, 32.7% intermediate, 32.1% resistant) and identification (only 34.1% correct) of this organism. Two of 28 teicoplanin resistant enterococci and three of 3...Continue Reading

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