China Animal Husbandry and Veterinary Medicine ›› 2022, Vol. 49 ›› Issue (10): 3943-3952.doi: 10.16431/j.cnki.1671-7236.2022.10.027

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Drug Resistance Analysis and Virulence Gene Detection of Salmonella in Slaughterhouses

JIN Haozhan1,2, LI Liang3, WEI Qilin1, HAN Yixin1, XU Zhihong1, KANG Huahua1, XIANG Rong1,4   

  1. 1. Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China;
    2. Foshan University, Foshan 528231, China;
    3. Agro-Tech Extension Center of Guangdong Province, Guangzhou 510520, China;
    4. Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Maoming 525000, China
  • Received:2022-03-22 Online:2022-10-05 Published:2022-09-30

Abstract: 【Objective】 This study was aimed to investigate the drug resistance and virulence characteristics of Salmonella carried in slaughtered pork in Maoming,Guangdong province,and provide a basis for hazard assessment and formulation of prevention and control measures for foodborne Salmonella in this area.【Method】 Nineteen strains of Salmonella isolated from pork,spleen and liver samples collected from slaughterhouses in Maoming,Guangdong province were tested for resistance to β-lactams,fluoroquinolones,aminoglycosides,tetracyclines,aminoglycols and sulfonamides by the K-B drug-sensitive paper method,and the β-lactam resistance genes (blaTEM,blaOXA-1 and blaSHV),fluoroquinolone resistance genes (qnrA,qnrS and qnrB),aminoglycoside resistance genes (aadA1,aac(6')-Ⅰb and rmtB),tetracycline resistance genes (tetA,tetB and tetC),aminol resistance genes (Cat1 and floR),sulfonamide resistance genes (SulⅠ,SulⅡ and SulⅢ) and 10 virulence genes (mogA,sseL,mgtC,bcfA,araB,spvR,spvA,spvB,spvC and spvD) were detected by PCR method.【Result】 19 strains of Salmonella were highly resistant to tetracycline,doxycycline,chloramphenicol,florfenicol and sulfaisoxazole,and the resistance rates were more than 50%,with the highest resistance rates of 89.5% (17/19) to tetracycline,doxycycline and chloramphenicol,and 89.5% to 3 or more antimicrobial drugs,with the highest resistance to all 11 antimicrobial drugs.The detection rate of blaTEM,qnrA,aadA1, aac(6')-Ⅰb,Cat1,floR,SulⅠ and SulⅢ resistance genes was high (≥50.0%),the highest detection rate of blaTEM resistance gene was 84.2%,73.7% of strains carried 5 or more resistance genes at the same time,and the highest strain carried 12 drug-resistant genes;mogA,mgtC,bcfA,araB virulence genes were all detected and the detection rate was above 70%,of which mogA virulence gene had a detection rate of up to 100%,and the remaining 6 virulence genes did not detect out.【Conclusion】 Salmonella from the pork of Maoming slaughterhouse in Guangdong province was seriously multidrug-resistance,carrying multiple drug-resistance genes with complex gene combinations and multiple virulence genes.

Key words: slaughterhouse; Salmonella; drug resistance; resistance gene; virulence gene

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