1株草龟维氏气单胞菌的分离鉴定及药敏谱分析

doi:10.11843/j.issn.0366-6964.2020.10.021

Abstract

Abstract: To determine the cause of death of Chinemys reevesii in a pet shop in Changli county, Hebei province, a dominant strain CLW-1 was isolated and purified from the diseased Chinemys reevesii. It was analyzed and identified through anatomical observation, bacterial isolation and culture, Gram staining and microscopic examination, biochemical identification and 16S rDNA gene sequencing, the drug resistance of the strain was detected through drug sensitivity test, and its pathogenicity was detected through zebrafish inoculation test and virulence gene experiment. The results showed that the bacteria formed moist, smooth surface, gray colony with β hemolysis on blood agar medium, and grew smooth and moist yellow colony on RS agar medium; Gram staining and microscopic examination showed negative coccidiosis; Homology analysis of 16S rDNA gene sequence showed that the isolated strain CLW-1 belongs to the same group with Aeromonas veronii, and the homology is above 99%; Inoculation test results of zebrafish showed that the strain had high pathogenicity, and its LD₅₀ was 1.26×10⁶ CFU; The virulence gene amplification results showed that the isolated strain CLW-1 had virulence genes of aerA, Exu, Lip and Ser; Drug sensitivity test results showed that the isolated strain CLW-1 was sensitive to piperacillin, cefazolin and enrofloxacin, etc; Susceptibility to furazolidone, oxacillin and erythromycin, etc; Resistance to midecamycin, clindamycin and vancomycin, etc. According to the test results, the isolated strain CLW-1 is confirmed to be Aeromonas veronii, which carries virulence genes and has high pathogenicity, it has great therapeutic effect by applying corresponding antibiotics, thus laying a foundation for the prevention and treatment of Aeromonas veronii.

Key words: Chinemys reevesii, Aeromonas veronii, isolation and identification, drug sensitivity test, virulence gene

CLC Number:

S852.61

WANG Miao, ZHANG Xuejia, DU Wannian, YU Xiujian, LIU Boxing, WU Tonglei, SHI Qiumei, ZHANG Zhiqiang. Isolation, Identification and Drug Sensitivity Test of a Strain of Aeromonas veronii from Chinemys reevesii[J]. Acta Veterinaria et Zootechnica Sinica, 2020, 51(10): 2528-2535.

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Isolation, Identification and Drug Sensitivity Test of a Strain of Aeromonas veronii from Chinemys reevesii

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