China Animal Husbandry and Veterinary Medicine ›› 2023, Vol. 50 ›› Issue (8): 3345-3353.doi: 10.16431/j.cnki.1671-7236.2023.08.032

• Preventive Veterinary Medicine • Previous Articles    

Analysis of Salmonella Resistance and PFGE Typing in Chicken Production Chain

WANG Yuyan, ZHANG Linji, CHI Lan, CHEN Yongliang, REN Shifei, SUN Peng   

  1. Xuzhou Vocational College of Bioengineering, Xuzhou 221006, China
  • Revised:2023-02-20 Published:2023-07-27

Abstract: 【Objective】 To understand the drug resistance and molecular typing characteristics of Salmonellain the chicken production chain of modern agricultural and animal husbandry food enterprises with the links of breeding,slaughtering,transportation and sales.【Method】 In this study,37 strains of Salmonella isolated from the continuous samples collected from the farms,slaughterhouses,transport vehicles and franchised stores of an agricultural and animal husbandry food enterprise in Northern Jiangsu from October 2020 to September 2021 were tested for 13 common antibiotics by paper diffusion method,11 drug resistance genes by PCR,and molecular typing by pulsed field gel electrophoresis (PFGE).【Result】 The 37 strains of Salmonella isolated were all resistant,the highest resistance rate to ampicillin was 67.57%,the resistance rate to doxycycline,gentamicin and tetracycline was more than 50%,and the lowest resistance rate to cefoxitin was 8.11%.The resistance rate of Salmonella isolated from all links to ampicillin was more than 50%.Along the chicken production chain,the resistance rate of ampicillin showed a downward trend,and the drug resistance rate of ceftazidime,ceftriaxone,ciprofloxacin and tetracycline also showed a downward trend.The antibiotic resistance rate of cefoxitin,trimethoprim,gentamicin,amikacin showed an upward trend.34 strains were resistant to three or more antibiotics,and the multidrug resistance rate was 94.59%.The multidrug resistance rate of Salmonella isolated in breeding,transportation and marketing was 100%.The number of drug-resistant strains of Salmonella isolated from the links of breeding was mostly concentrated in 7 or more antibiotics,and the drug resistance rate to 8 antibiotics was higher than that of other links.The detection rate of drug resistance gene blaPSE was the highest,and its detection rate was 56.76%.The drug resistance gene tetC was not detected.PFGE classification had produced 26 different PFGE belt types,and there were 7 groups of belt types with 100% similarity.【Conclusion】 Salmonella isolated from the chicken production chain of a modern agricultural and animal husbandry food enterprise in Northern Jiangsu had high drug resistance and serious multidrug resistance,and the drug resistance in the breeding link was higher than that in other links.PFGE typing suggested that the drug resistant strains could spread along the "Breeding-slaughtering"route of the chicken production chain,and existed for a long time.Avoiding the production of drug resistant Salmonella in the breeding link was the key point to ensure the safe production of chicken products.

Key words: chicken production; Salmonella; drug resistance; PFGE

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