Animal Husbandry and Feed Science ›› 2025, Vol. 46 ›› Issue (4): 122-128.doi: 10.12160/j.issn.1672-5190.2025.04.017

• Animal Disease Prevention and Control • Previous Articles    

Isolation, Identification, and Antimicrobial Resistance Detection of Enterococcus faecalis from Animal Sources in Jilin Province

YU Hui1, LI Jinlei2, FANG Zhongyi2, YANG Xixiang2, WEI Qian2, CHANG Jiang1   

  1. 1. Henan Provincial Animal Quarantine General Station,Zhengzhou 450008,China;
    2. Henan Provincial Institute for Inspection Technology of Agricultural, Livestock and Aquatic Products,Zhengzhou 450008,China
  • Received:2025-05-12 Online:2025-07-30 Published:2025-10-28

Abstract: [Objective] To investigate the antimicrobial resistance profiles of Enterococcus faecalis isolated from animal sources in Jilin Province. [Methods] A total of 400 samples were collected from large-scale layer chicken farms, pig farms, and dairy cow farms across eight prefecture-level cities and one autonomous prefecture in Jilin Province. Bacterial isolation and purification were performed, followed by identification using Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF MS) and susceptibility to 18 antibiotics was tested using the broth microdilution method. [Results] A total of 87 E. faecalis strains were isolated, with an overall isolation rate of 21.75% (87/400). Specifically, 43 strains were isolated from chickens (isolation rate:30.71%, 43/140), 33 from pigs (isolation rate:20.63%, 33/160), and 11 from dairy cows (isolation rate: 11.00%, 11/100). Chicken-derived E. faecalis exhibited resistance rates exceeding 80% to cefoxitin, clindamycin, ceftiofur, tiamulin, tilmicosin, tetracycline, erythromycin, and oxacillin. Pig-derived E. faecalis showed resistance rates above 80% to cefoxitin, clindamycin, ceftiofur, tiamulin, tetracycline, erythromycin, oxacillin, gentamicin, and tilmicosin. Dairy cow-derived E. faecalis displayed a 100% resistance rate to tilmicosin, while resistance to other Antimicrobial (except gentamicin) was below 10.00%. Overall, the multidrug resistance rate was 85.07%, with resistance to 9 drugs being the most prevalent, accounting for 26.87% of isolates. [Conclusion] The resistance rates of E. faecalis from layer and pig farms in Jilin Province are high, with severe multidrug resistance observed.

Key words: Jilin Province, animal sources, Enterococcus faecalis, isolation and identification, antimicrobialresistance detection

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