Isolation and identification of Acinetobacter lwoffii from the Chinese Giant Salamander (Andrias davidianus)

文献类型： 外文期刊

第一作者： Mao, Pan

作者： Mao, Pan;Xie, Yixing;Wang, Cheng;Deng, Zhiyong;Yuan, Huayan;Tian, Mingzhu;Wei, Ying;Zhou, Yong

作者机构：

关键词： Andrias davidianus; Acinetobacter lwoffii; Isolation; identification

期刊名称：ISRAELI JOURNAL OF AQUACULTURE-BAMIDGEH （ 影响因子：0.4； 五年影响因子：0.5 ）

ISSN： 0792-156X

年卷期： 2024 年 76 卷 3 期

页码：

收录情况： SCI

摘要： This study aimed to identify the primary pathogenic bacteria responsible for the mortality of the Chinese giant salamander (Andriasd davidianus). A pathogenic bacterium was isolated from a diseased Chinese giant salamander exhibiting typical symptoms under aseptic conditions and then identified by morphological examinations, biochemical analysis, and the sequence analysis of bacterial 16S rRNA. Artificial infection testing was then conducted to determine the pathogenicity of the isolated bacteria strain. Drug susceptibility tests were conducted using the agar diffusion method. The isolated pathogenic bacteria, named DN-2, was successfully identified as Acinetobacter lwoffii. The artificial infection showed that the typical symptoms of the disease could be replicated as the ones originally occurred, and this bacterium exhibited high pathogenicity to the Chinese giant salamander. In the Chinese giant salamander, the median lethal dosage (LD50) of A. lwoffii DN-2 for A. davidianus was determined to be 4.63x104 CFU/g. Drug sensitivity testing showed that these bacteria were highly sensitive to erythromycin, gentamicin, neomycin, streptomycin, midecamycin, ciprofloxacin, piperacillin, florfenicol, doxycycline, carbenicillin, and sulfanilamide. In summary, A. lwoffii was identified as the primary pathogen responsible for the demise of A. davidianus. Our study first presents how these bacteria harm Chinese giant salamanders.

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