ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2018, Vol. 49 ›› Issue (5): 1081-1088.doi: 10.11843/j.issn.0366-6964.2018.05.024

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Isolation, Identification and Antimicrobial Resistance of Salmonella from Dead Chicken Embryos in Sanhuang Breeder Farms

XU Yao-hui*, DENG Tong-wei, QI Ya-ru, HAN Wen-long, LU Jian-zhou, JIANG Zeng-hai   

  1. College of Veterinary Medicine, Henan University of Animal Husbandry and Economy, Zhengzhou 450046, China
  • Received:2017-10-30 Online:2018-05-23 Published:2018-05-23

Abstract:

To investigate current infection statuses of Salmonella in dead chicken embryos, Salmonella strains was isolated and identified from dead embryo samples collected from 4 hatcheries attached to their parental flocks of Sanhuang Chickens, and the drug resistance and resistance genes were detected by Kirby-Bauer Test and PCR method, respectively. A total of 173 Salmonella isolates were obtained from 356 dead embryos,including 5 serotypes:S. pullorum(162),S. blegdam (5),S. Cerro (4),S. enteritidis(1), S. Fillmore(1). Results showed that the isolation rate and drug resistance of Salmonella in dead embryos from different sources were significantly different. Of total 173 Salmonella isolates, the drug resistance rate to Sulfisoxazole (SF), Ampicillin (AMP), Tetracycline (TE) and Oxytetracycline (OT) were 82.1%, 74.0%, 49.1% and 48.6%. And 43.4% (75/173) isolates showed multiple drug resistance. The resistance to other drugs was mild, and the resistance rate was below 11%. The isolates were sensitive to Ceftazidime (CAZ), Meropenem (MEM), Imipenem (IPM), Polymyxin E (CT), Chloramphenicol (C), Enrofloxacin (ENR) and Ciprofloxacin (CIP). In addition, 13 drug-resistant genes were detected by PCR, and the coincidence rate between drug-resistant phenotype and drug-resistant genes was more than 72%, especially the rate were 100% to extended-spectrum beta-lactamases (ESBLs), aminoglycosides, cephalosporins. The results indicate that serotypes of Salmonella infected in Sanhuang chicken embryos are complex, the multi-drug resistance is serious and the resistance genes are widely existed in these resistant strains.

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