PMID- 33498972 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20210316 IS - 2076-0817 (Print) IS - 2076-0817 (Electronic) IS - 2076-0817 (Linking) VI - 10 IP - 2 DP - 2021 Jan 22 TI - Evidence for Establishing the Clinical Breakpoint of Cefquinome against Haemophilus Parasuis in China. LID - 10.3390/pathogens10020105 [doi] LID - 105 AB - Haemophilus parasuis can cause high morbidity and mortality in swine. Cefquinome possesses excellent antibacterial activity against pathogens causing diseases of the respiratory tract. This study aimed to establish the clinical breakpoint (CBP) of cefquinome against H. parasuis and to monitor the resistance change. Referring to the minimum inhibitory concentration (MIC) distribution of cefquinome against 131 H. parasuis isolates, the MIC(50) and MIC(90) were determined to be 0.125 and 1 mug/mL, respectively. And the epidemiological cutoff (ECOFF) value was 1 mug/mL. HPS42 was selected as a representative strain for the pharmacodynamic (PD) experiment, pharmacokinetic (PK) experiment and clinical experiments. The PK/PD index values, area under concentration-time curve (AUC)/MIC, of the bacteriostatic, bactericidal, and bacterial elimination effects were 23, 41, and 51 h, respectively. The PK/PD cutoff was calculated as 0.125 mug/mL by Monte Carlo simulation (MCS), and the clinical cutoff was 0.25-4 mug/mL by WindoW. Combing these three values, the CBP of cefquinome against H. parasuis was found to be 1 mug/mL. In conclusion, this was the first study to integrate various cutoffs to establish the CBP in the laboratory. It is helpful to distinguish wild type H. parasuis and reduce the probability of treatment failure. FAU - Mi, Kun AU - Mi K AUID- ORCID: 0000-0001-7058-1849 AD - National Reference Laboratory of Veterinary Drug Residues (HZAU), Wuhan 430000, China. FAU - Sun, Da AU - Sun D AD - National Reference Laboratory of Veterinary Drug Residues (HZAU), Wuhan 430000, China. FAU - Li, Mei AU - Li M AD - MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan 430000, China. FAU - Hao, Haihong AU - Hao H AUID- ORCID: 0000-0003-0199-5700 AD - National Reference Laboratory of Veterinary Drug Residues (HZAU), Wuhan 430000, China. AD - MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan 430000, China. FAU - Zhou, Kaixiang AU - Zhou K AD - MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan 430000, China. FAU - Liu, Zhenli AU - Liu Z AD - National Reference Laboratory of Veterinary Drug Residues (HZAU), Wuhan 430000, China. AD - MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan 430000, China. FAU - Yuan, Zonghui AU - Yuan Z AD - National Reference Laboratory of Veterinary Drug Residues (HZAU), Wuhan 430000, China. AD - MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan 430000, China. AD - MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan 430000, China. FAU - Huang, Lingli AU - Huang L AD - National Reference Laboratory of Veterinary Drug Residues (HZAU), Wuhan 430000, China. AD - MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan 430000, China. AD - MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan 430000, China. LA - eng GR - 2016YFD0501310/National key research and development program/ GR - 2662017PY081/Fundamental research funds for the Central Universities/ PT - Journal Article DEP - 20210122 PL - Switzerland TA - Pathogens JT - Pathogens (Basel, Switzerland) JID - 101596317 PMC - PMC7912692 OTO - NOTNLM OT - Haemophilus parasuis OT - PK/PD cutoff OT - cefquinome OT - clinical breakpoint OT - clinical cutoff OT - epidemiological cutoff COIS- The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. EDAT- 2021/01/28 06:00 MHDA- 2021/01/28 06:01 PMCR- 2021/01/22 CRDT- 2021/01/27 01:07 PHST- 2020/11/30 00:00 [received] PHST- 2021/01/05 00:00 [revised] PHST- 2021/01/05 00:00 [accepted] PHST- 2021/01/27 01:07 [entrez] PHST- 2021/01/28 06:00 [pubmed] PHST- 2021/01/28 06:01 [medline] PHST- 2021/01/22 00:00 [pmc-release] AID - pathogens10020105 [pii] AID - pathogens-10-00105 [pii] AID - 10.3390/pathogens10020105 [doi] PST - epublish SO - Pathogens. 2021 Jan 22;10(2):105. doi: 10.3390/pathogens10020105.