Abstract
Background: In this study (part of the global TEST program), the in vitro activity of tigecycline, a member of a new class of antimicrobial agents, the glycylcyclines, against clinical isolates collected in Italy was evaluated. Methods: A total of 200 clinical isolates were collected and identified in our institution during 2005. Minimum inhibitory concentrations (MICs) of the antimicrobial agents were determined by the broth microdilution method recommended by the CLSI in 2005. Results: Globally, 135 Gram-negative and 65 Gram-positive pathogens were evaluated. Tigecycline demonstrated excellent inhibitory activity against Acinetobacter spp., Haemophilus influenzae, Escherichia coli, Enterococcus spp., Staphylococcus aureus, Streptococcus agalactiae and Streptococcus pneumoniae with MIC<sub>90</sub> ≤1 mg/l. Conclusion: Tigecycline exhibited potent in vitro antibacterial activity (comparable to or greater than most commonly employed antimicrobials) against both Gram-positive and Gram-negative clinical pathogens. These data suggest that tigecycline, with an expanded broad-spectrum antimicrobial activity, may be an effective empiric therapeutic option for the treatment of serious infections caused by clinically relevant pathogens.
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