Single-concentration broth microdilution test for detection of high-level aminoglycoside resistance in enterococci.
Growth in a single broth microdilution well containing gentamicin at a concentration of 500 micrograms/ml predicted high-level resistance to gentamicin (MIC, greater than or equal to 2,000 micrograms/ml) in 505 of 508 clinical isolates of enterococci. Failure to achieve synergistic killing with the combination of penicillin and an aminoglycoside was demonstrated with 100% specificity in 20 strains which showed resistance to 500 micrograms of gentamicin per ml. We recommend this procedure be adopted as a routine screening test to detect high-level aminoglycoside resistance in enterococci.
D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D004352:Drug Resistance, Microbial; D004357:Drug Synergism; D013293:Enterococcus faecalis / Q000187:drug effects*; D005839:Gentamicins / Q000494:pharmacology*; D006801:Humans; D008826:Microbial Sensitivity Tests; D010406:Penicillins / Q000494:pharmacology
D000900:Anti-Bacterial Agents; D005839:Gentamicins; D010406:Penicillins