Acta Veterinaria et Zootechnica Sinica ›› 2024, Vol. 55 ›› Issue (8): 3640-3648.doi: 10.11843/j.issn.0366-6964.2024.08.035

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Isolation, Identification and Drug Resistance Analysis of Klebsiella pneumoniae in Aborted Fetuses of Fox

Qilin WANG(), Runlai CAO, Weiyang WANG, Bo ZHANG, Zhijie LIU, Xiaoxu WANG*()   

  1. Key Laboratory of Special Animal Epidemic Disease, Ministry of Agriculture/Institute of Special Animal and Plant Sciences, Chinese Academy of Agricultural Sciences, Changchun 130112, China
  • Received:2023-10-27 Online:2024-08-23 Published:2024-08-28
  • Contact: Xiaoxu WANG E-mail:wangqilin@caas.cn;wangxiaoxussdd@126.com

Abstract:

In order to understand the etiology of abortion in foxes, the aborted fetuses in a fox farm in Hebei Province was analyzed by dissection, pathogen isolation and cultivation, 16S rRNA sequencing, virulence gene detection, serotype detection, drug susceptibility analysisassay and pathogenicity analysis assay in this study. As a result, 6 strains of Klebsiella pneumoniae were isolated. Twelve virulence genes (wabG, fimH, ent, icuA, icuB, mrkA, ycf, ecp, uge, ureA, iroB and ybtA) and three serotypes (K20, K54 and K57) were determined, and the K57 was the dominant serotype. Through K-B drug susceptibility testing, it showed that the isolated K. pneumoniae was moderately or highly sensitive to aminoglycosides, cephalosporins, quinolones, polypeptides and other antibacterial drugs, and multiple drug resistance to macrolides, tetracycline, penicillin and other antibacterial drugs was found. According to the pathogenicity analysis, the K. pneumoniae isolate had certain pathogenicity to mice, and the median lethal dose (LD50) was 1.2×107 CFU·mL-1. In general, K. pneumoniae isolate showed certain pathogenicity, drug resistance, and carrying a variety of virulence genes in this study, and it might be one of the factors causing abortion of fox fetuses. The findings might provide hints for prevention and control of fox fetal abortion.

Key words: fox, Klebsiella pneumoniae, virulence gene, solation and identification

CLC Number: