Acta Veterinaria et Zootechnica Sinica ›› 2022, Vol. 53 ›› Issue (2): 548-555.doi: 10.11843/j.issn.0366-6964.2022.02.021

• PREVENTIVE VETERINARY MEDICINE • Previous Articles     Next Articles

Isolation, Identification and Drug Resistance Analysis of Pseudomonas aeruginosa from Dead Embryos and Environment Samples of Hatchery in Breeding Chicken Farms

YU Yun1, XIANG Yong1, LI Qingbo1, LIU Peng1, LI Lizhen1, LIAO Ming2,3,4,5,6, CAO Weisheng1,3,4,5,6*   

  1. 1. College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China;
    2. Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, China;
    3. Key Laboratory of Zoonosis of Ministry of Agriculture and Rural Affairs, Guangzhou 510642, China;
    4. Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou 510642, China;
    5. National and Regional Joint Engineering Laboratory for Medicament of Zoonosis Prevention and Control, Guangzhou 510642, China;
    6. Key Laboratory of Animal Vaccine Development, Ministry of Agriculture and Rural Affairs, Guangzhou 510642, China
  • Received:2021-05-17 Online:2022-02-23 Published:2022-03-02

Abstract: This study aims to investigate the prevalence and drug resistance of Pseudomonas aeruginosa (PA) in breeder farms in Guangdong Province. Samples of dead embryos of breeding chickens and their surrounding environment were collected from different regions of Guangdong Province for the separation and identification of PA. The K-B paper disk diffusion method was used to analyze its antimicrobial sensitivity, and its resistance genes were detected by conventional PCR. The results showed that a total of 77 strains of PA (77/679, 11.3%) including 2 strains from environmental samples (2/24, 8.3%) and 75 strains (75/655, 11.5%) from dead embryos were isolated. The drug susceptibility test showed that the highest drug resistance rate was compound trimethoprim (100%) and tetracycline (100%), followed by chloramphenicol (75.4%). In addition, drug-resistant strains were also detected in the third-generation cefotaxime, the drug resistance rate reached 9.3%; It is worth noting that the multi-drug resistance rate is as high as 62.3%; the resistance genes qacE△1-sul1 (29.9%) and ant(3″)-I (29.9%) have the highest detection rate, followed by DHA (28.3%), and the positive rate of oprD2 gene was 11.7%, suggesting that its resistance to carbapenem antimicrobial drugs has a high level of transfer risk. In summary, there were varying degrees of PA infection or pollution in the five breeder farms and their surroundings in Guangdong Province, and the isolated and identified strains showed strong drug resistance. Therefore, it is suggested that the five poultry farms should strengthen the breeding management during the breeding process, clean and disinfect the breeding eggs. On the other hand, drug susceptibility tests should be conducted regularly, and antibiotics should be used rationally to minimize the emergence of drug-resistant and multi-drug resistant strains.

Key words: breeding chicken farms, dead embryos, Pseudomonas aeruginosa, antimicrobial resistance, resistance genes

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