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Antimicrob Agents Chemother. 2006 Jul;50(7):2577-82.

Interactions between glycopeptides and beta-lactams against isogenic pairs of teicoplanin-susceptible and -resistant strains of Staphylococcus haemolyticus.

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  • 1Institute of Microbiology and Biomedical Sciences, Polytechnic University of Marche, Via Ranieri, Monte d'Ago, 60131 Ancona, Italy.


Four isogenic derivatives with stably increased glycopeptide MICs (all become resistant to teicoplanin) were obtained from four glycopeptide-susceptible clinical isolates of Staphylococcus haemolyticus. All strains were extensively analyzed and compared for a number of distinctive features. In particular, the results provided insights into the puzzling issue of antistaphylococcal interactions between glycopeptides and beta-lactams, especially the paradox of double zones around beta-lactam disks and the relationships between autolysis rate and type of interaction.

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