In-vitro activity of levofloxacin against bacterial pathogens collected in China：A ten-year（2009-2018） retrospective study
Abstract
Abstract Background： This study was designed to evaluate the in-vitro activity of levofloxacin against bacterial pathogens collected from Chinese hospitalized patients between 2009 and 2018, and analysis the trends of levofloxacin resistance in China.Methods In this analysis, antimicrobial minimum inhibitory concentrations (MICs) experiments with levofloxacin and controls against a range of Gram-positive and Gram-negative bacteria collected from 2009 to 2018. MICs were determined using the agar dilution method according to the guidelines of Clinical and Laboratory Standards Institute (CLSI)，2019. Antimicrobial susceptibility was determined using CLSI breakpoints. Statistical tests were analysed by Statistical Package for the Social Sciences software (SPSS, Inc., Chicago, IL, USA), calculating the MIC90.Results In the past decade，the antibacterial activities of levofloxacin against Escherichia coli, Enterobacter cloacae, Pseudomonas aeruginosa and Stenotrophomonas maltophilia, which were common gram-negative bacteria, were stable; the resistance rates of these bacteria had no significant changes or decreased slightly. The levofloxacin resistance rates of Staphylococcus aureus and Enterococcus faecalis, which were gram positive bacteria, decreased from 48.4% and 36.9% in 2009-2010 to 22.8% and 25.7% in 2017-2018, respectively, respectively. The levofloxacin resistance rate among Haemophilus influenzae, Streptococcus pneumoniae and Streptococcus pneumoniae, the common pathogens…
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