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Wang F, Luo W, Pan Y, Qu W, Xie S, Huang L, Wang Y. Antibacterial activity of combined aditoprim and sulfamethoxazole against Escherichia coli from swine and a dose regimen based on pharmacokinetic-pharmacodynamic modeling. J Vet Pharmacol Ther 2021; 45:133-145. [PMID: 34435681 DOI: 10.1111/jvp.13006] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2020] [Revised: 07/31/2021] [Accepted: 08/01/2021] [Indexed: 11/26/2022]
Abstract
The mortality of livestock caused by pathogenic Escherichia coli (E. coli) still accounts for a large proportion of deaths in large-scale production and reproduction, which causes devastating economic losses to the pig breeding industry. The aims of this study were to investigate the antibacterial activity of combined aditoprim (ADP) and sulfamethoxazole (SMZ) against clinical isolates of E. coli from pigs and to develop a pharmacokinetic-pharmacodynamic (PK-PD) model to formulate the optimal dose of ADP/SMZ for the treatment of pig colibacillosis. Blood and ileum fluid samples were collected at different times after single intramuscular injection of ADP/SMZ (5/25 mg/kg b.w.) to healthy pigs and E. coli-infected pigs. Concentrations of ADP and SMZ in plasma and ileum fluid were analyzed by HPLC. The peak concentration (Cmax ) and the area under the concentration-time curve (AUC0-24h ) in ileum fluid of healthy pigs were 1.76 ± 0.27 µg/ml and 18.92 ± 2.87 µg·h/ml for ADP and 19.15 ± 2.63 µg/ml and 125.70 ± 11.86 µg·h/ml for SMZ, respectively. Cmax and AUC0-24h in ileum fluid of infected pigs were 1.88 ± 0.13 µg/ml and 15.12 ± 0.75 µg·h/ml for ADP and 19.71 ± 3.68 µg/ml and 133.92 ± 17.14 µg·h/ml for SMZ, respectively. The minimum inhibitory concentrations (MICs) of combined ADP and SMZ (ADP/SMZ) against 185 strains of E. coli from pigs were determined. The MIC50 and MIC90 of ADP/SMZ were 0.5/2.5 and 4/20 µg/ml, respectively. The MIC of the selected pathogenic E. coli SHC28 was 0.5/2.5 µg/ml in Mueller-Hinton broth and 0.25/1.25 µg/ml in ileum fluid, respectively. In vitro, the mutant prevention concentration, the post-antibiotic effect, growth, and time-killing curves in vitro and ex vivo of ADP/SMZ against the isolate SHC28 were assayed for PD studies. The results showed that ADP/SMZ exhibited strong concentration-dependent antimicrobial activity against E. coli. After integrating the in vivo pharmacokinetic parameters of infected pigs and ex vivo PD data using the sigmoid Emax (Hill) equation, the AUC24h /MIC values in ileum fluid for bacteriostatic, bactericidal, and bacterial eradication were 18.84, 65.39, and 110.68 h, respectively. In conclusion, a dosage of 3.45/17.25 mg/kg ADP/SMZ by intramuscular injection daily for 3 consecutive days may be sufficient to treat swine colibacillosis due to E. coli with a MIC of 0.5/2.5 µg/ml.
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Affiliation(s)
- Fang Wang
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MOA Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, China.,College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Wanhe Luo
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MOA Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, China.,College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Yuanhu Pan
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MOA Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, China.,College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Wei Qu
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MOA Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, China.,College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Shuyu Xie
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MOA Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, China.,College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Lingli Huang
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MOA Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, China.,College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, China
| | - Yulian Wang
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MOA Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, China.,College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, China
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Maan MK, Weng Z, Dai M, Liu Z, Hao H, Cheng G, Wang Y, Wang X, Huang L. The Spectrum of Antimicrobial Activity of Cyadox against Pathogens Collected from Pigs, Chicken, and Fish in China. Antibiotics (Basel) 2021; 10:antibiotics10020153. [PMID: 33546407 PMCID: PMC7913539 DOI: 10.3390/antibiotics10020153] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 01/28/2021] [Accepted: 01/28/2021] [Indexed: 11/30/2022] Open
Abstract
Cyadox has potential use as an antimicrobial agent in animals. However, its pharmacodynamic properties have not been systematically studied yet. In this study, the in vitro antibacterial activities of cyadox were assayed, and the antibacterial efficacy of cyadox against facultative anaerobes was also determined under anaerobic conditions. It was shown that Clostridium perfringens and Pasteurella multocida (MIC = 0.25 and 1 μg/mL) from pigs, Campylobacter jejuni and Pasteurella multocida from poultry, E. coli, Streptococcus spp., and Flavobacterium columnare from fish were highly susceptible to cyadox (MIC= 1 and 8 μg/mL). However, F. columnare has no killing effect for drug tolerance. Under in vitro anaerobic conditions, the antibacterial activity of cyadox against most facultative anaerobes was considerably enhanced Under anaerobic conditions for the facultative anaerobes, susceptible bacteria were P. multocida, Aeromonas spp. (including A. hydrophila, A. veronii, A. jandaei, A. caviae, and A. sobria, excluding A. punctata), E. coli, Salmonella spp. (including S. choleraesui, S. typhimurium, and S. pullorum), Proteus mirabilis, Vibrio fluvialis, Yersinia ruckeri, Erysipelothrix, Acinetobacter baumannii, and Streptococcus agalactiae (MICs were 0.25~8 μg/mL, MBCs were 1–64 μg/mL). Intermediate bacteria were Enterococcus spp. (including E. faecalis and E. faecium), Yersinia enterocolitica, and Streptococcus spp. (MICs mainly were 8~32 μg/mL, MBCs were 16~128 μg/mL). This study firstly showed that cyadox had strong antibacterial activity and had the potential to be used as a single drug in the treatment of bacterial infectious diseases.
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