The pharmacokinetics and pharmacodynamics of cefquinome against Streptococcus agalactiae in a murine mastitis model

文献类型： 外文期刊

第一作者： Yang, Qingwen

作者： Yang, Qingwen;Yong, Kang;Lv, Qian;Zhang, Yi;Zhang, Chenghuan;Liu, Yun;Liu, Xuesong;Chen, Liang;Zhong, Peng;Liu, Xuesong;Zhong, Peng;Zhang, Longfei

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期刊名称：PLOS ONE （ 影响因子：3.7； 五年影响因子：3.8 ）

ISSN： 1932-6203

年卷期： 2023 年 18 卷 1 期

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收录情况： SCI

摘要： Cefquinome is a new generation cephalosporin that is effective in the treatment of mastitis in animals. In this study, we evaluated the associations between the specific pharmacokinetics and pharmacodynamics (PK/PD) of cefquinome and its antibacterial activity against Streptococcus agalactiae in a mouse model of mastitis. After a single intramammary dose of cefquinome (30, 60, 120, and 240 mu g/mammary gland), the concentration of cefquinome in plasma was analysed by liquid chromatography with tandem mass spectrometry (HPLC/MS-MS). The PK parameters were calculated using a one-compartment first-order absorption model. Antibacterial activity was defined as the maximum change in the S. agalactiae population after each dose. An inhibitory sigmoid E-max model was used to evaluate the relationships between the PK/PD index values and antibacterial effects. The duration for which the concentration of the antibiotic (%T) remained above the minimum inhibitory concentration (MIC) was defined as the optimal PK/PD index for assessing antibacterial activity. The values of %T > MIC to reach 0.5-log(10)CFU/MG, 1-log(10) CFU/MG and 2-log(10) CFU/MG reductions were 31, 47, and 81%, respectively. When the PK/PD index %T > MIC of cefquinome was >81% in vivo, the density of the Streptococcus agalactiae was reduced by 2-log(10). These findings provide a valuable understanding to optimise the dose regimens of cefquinome in the treatment of S. agalactiae infections.

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