Phenotype-Specific Semi-Mechanistic Modelling of Florfenicol Time-Kill Curves in G. Parasuis Compared to Other Respiratory Pathogens.

IF 1.5 4区 农林科学 Q3 PHARMACOLOGY & PHARMACY
Andrew Mead, Abigail Hughes, Stefano Azzariti, Pierre-Louis Toutain, Ludovic Pelligand
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引用次数: 0

Abstract

This study examines the pharmacodynamics (PD) of florfenicol (FFN) for treating porcine respiratory diseases by comparing its effects on Glaesserella parasuis, Actinobacillus pleuropneumoniae and Pasteurella multocida. In vitro time-kill assays and semi-mechanistic PD modeling were used to assess bacterial growth and killing rates at varying FFN concentrations. Species-specific PD models indicated that fAUC/MIC was the best PK/PD index across all species. A. pleuropneumoniae and P. multocida had target values of 1.05 and 1.66 × MIC, respectively for bacteriostasis and 1.12 and 1.87 × MIC for 99.9% kill. Two phenotypes of G. parasuis emerged "fast-kill" and "slow-kill" which displayed distinct bacterial eradication rates despite similar MICs. For "slow-kill" isolates, an average free drug concentration (fAUC/MIC) of 1.46 and 1.63 × MIC (median, range: 1.53-1.69) was required for bacteriostasis and 99.9% kill. "Fast-kill" isolates needed an average free drug concentration of 1.38 × MIC for bacteriostasis and 1.51 × MIC for a 99.9% reduction. Indicating that the rate of kill influences the respective average free concentration required to achieve an equivalent antibacterial effect. Simulations of clinical dosing of FFN predicted bacterial eradication for all species, highlighting the value of phenotype-specific PD modeling in guiding treatment strategies for porcine respiratory infections.

与其他呼吸道病原体相比,副猪螺旋体氟苯尼考时间杀伤曲线的表型特异性半机制建模。
本研究通过比较氟苯尼考(FFN)对副猪绿杆菌、胸膜肺炎放线杆菌和多杀性巴氏杆菌的作用,探讨了氟苯尼考(FFN)治疗猪呼吸道疾病的药效学。采用体外时间杀伤法和半机械PD模型来评估不同FFN浓度下的细菌生长和杀伤率。物种特异性PD模型表明,fac /MIC是所有物种的最佳PK/PD指数。胸膜肺炎单胞菌和多杀性单胞菌抑菌目标值分别为1.05和1.66 × MIC, 99.9%杀灭目标值分别为1.12和1.87 × MIC。副猪螺旋体出现了“快杀”和“慢杀”两种表型,尽管mic相似,但它们的细菌根除率不同。对于“慢杀”菌株,平均游离药物浓度(fac /MIC)为1.46和1.63 × MIC(中位数,范围:1.53-1.69),抑菌和99.9%的杀死所需。“快杀”菌株需要平均游离药物浓度为1.38 × MIC才能达到抑菌效果,1.51 × MIC才能达到99.9%的抑菌效果。表明杀灭速度影响达到同等抗菌效果所需的各自的平均游离浓度。临床给药FFN的模拟预测了所有物种的细菌根除,突出了表型特异性PD模型在指导猪呼吸道感染治疗策略方面的价值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
3.10
自引率
15.40%
发文量
69
审稿时长
8-16 weeks
期刊介绍: The Journal of Veterinary Pharmacology and Therapeutics (JVPT) is an international journal devoted to the publication of scientific papers in the basic and clinical aspects of veterinary pharmacology and toxicology, whether the study is in vitro, in vivo, ex vivo or in silico. The Journal is a forum for recent scientific information and developments in the discipline of veterinary pharmacology, including toxicology and therapeutics. Studies that are entirely in vitro will not be considered within the scope of JVPT unless the study has direct relevance to the use of the drug (including toxicants and feed additives) in veterinary species, or that it can be clearly demonstrated that a similar outcome would be expected in vivo. These studies should consider approved or widely used veterinary drugs and/or drugs with broad applicability to veterinary species.
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