Activity of cefquinome against extended-spectrum beta-lactamase-producing Klebsiella pneumoniae in neutropenic mouse thigh model

文献类型： 外文期刊

第一作者： Shan, Q.

作者： Shan, Q.;Wang, J.

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期刊名称：JOURNAL OF VETERINARY PHARMACOLOGY AND THERAPEUTICS （ 影响因子：1.786； 五年影响因子：1.7 ）

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收录情况： SCI

摘要： Increasing prevalence of extended-spectrum beta-lactamase (ESBL)-producing Klebsiella pneumoniae (K.pneumoniae) is of clinical concern. The objective of our study was to examine the invivo activity of cefquinome against ESBL-producing K.pneumoniae strain using a neutropenic mouse thigh infection model. Cefquinome kinetics and protein binding in infected neutropenic mice were measured by liquid chromatography-tandem mass spectrometry (LC-MS/MS). Dose-fractionation studies over a 24-h dose range of 2.5-320 mg/kg were administered every 3, 6, 12, or 24 h. The percentage of the dosing interval that the free-drug serum levels exceed the MIC (%fT > MIC) was the PK-PD index that best correlated with cefquinome efficacy (R-2 = 86%). Using a sigmoid E-max model, the magnitudes of %fT > MIC producing net bacterial stasis, a 1-log(10) kill and a 2-log(10) kill over 24 h, were estimated to be 20.07%, 29.57%, and 55.12%, respectively. These studies suggest that optimal cefquinome PK/PD targets are not achieved in pigs, sheep, and cattle at current recommended doses (1 similar to 2mg/kg). Further studies with higher doses in the target species are needed to ensure therapeutic concentration, if cefquinome is used for treatment of K.pneumoniae infection.

分类号： S85

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