In Vitro activity of telithromycin and quinupristin/dalfopristin against methicillin-resistant coagulase-negative staphylococci with defined resistance genotypes
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- 作者：G. Novotná (1)
J. Spí?ek (1)
J. Janata (1) - 刊名：Folia Microbiologica
- 出版年：2007
- 出版时间：November 2007
- 年：2007
- 卷：52
- 期：6
- 页码：593-599
- 全文大小：265KB
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J. Spí?ek (1)
J. Janata (1)
1. Institute of Microbiology, Academy of Sciences of the Czech Republic, 142 20, Prague, Czechia
文摘
We determined the activities of new antibiotics telithromycin (ketolide) and quinupristin/dalfopristin (streptogramins) against 88 macrolide and/or lincosamide resistant coagulase-negative staphylococci (CoNS) isolates with defined resistance gene status. Telithromycin susceptibility was determined only in erythromycin-sensitive isolates (15) indicating the same mechanisms of resistance. In contrast, all erythromycin-resistant isolates (73) were either constitutively resistant to telithromycin (13 isolates with constitutiveerm genes) or demonstrated telithromycin D-shaped zone (60 isolates with induciblemsr(A) and/orerm). However, the level of inducible resistance conferred bymsr(A) (35 isolates) was borderline even after induction by erythromycin. No quinupristin/dalfopristin resistant isolate was observed if tested by disk-diffusion method (DDM) but 18 isolates were intermediate (MIC = 1- mg/L) and two isolates resistant (MIC = 8 mg/L) if tested by E-test. All these isolates were resistant to streptogramin A and harboredvga(A) gene (1 isolate) orvga(A)LC gene (19 isolates). MICs for quinupristin/dalfopristin were higher for isolates with combination of streptogramin A resistance and constitutive MLSB resistance (MIC = 3- mg/L in 4 isolates) than for streptogramin A-resistant isolates susceptible to streptogramin B (MIC = 0.5- mg/L in 16 isolates). In addition toS. haemolyticus, vga(A)LC was newly identified inS. epidermidis andS. warnerii indicating its widespread occurrence in CoNS. Misidentification of low-level resistant isolates by DDM may contribute to dissemination of streptogramin A resistance.