Isolation and Identification of Staphylococcus saprophyticus from Diseased Hybrid Sturgeon
文献类型： 外文期刊
作者： Wu, Yeying 1 ; Feng, Yalan 1 ; Xue, Mingyang 2 ; Xiao, Zidong 2 ; Jin, Lijuan 3 ; Gao, Ren 4 ; Chen, Yahong 1 ; Liang, Tianwang 1 ; Zhou, Yong 2 ;
作者机构： 1.Wuchang Univ Technol, Coll Life Sci, Wuhan 430200, Peoples R China
2.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Wuhan 430223, Peoples R China
3.Wuhan Dynam Life Sci Co Ltd, Wuhan 430223, Peoples R China
4.Zhaoqing Dahuanong Biol Med Co Ltd, Zhaoqing 526238, Peoples R China
关键词： hybrid sturgeon; Staphylococcus saprophyticus; histopathology; hematological parameters; drug sensitivity
期刊名称：FISHES （ 影响因子：2.3； 五年影响因子：2.4 ）
ISSN：
年卷期： 2023 年 8 卷 5 期
页码：
收录情况： SCI
摘要： Hybrid sturgeon is an important economic fish species in China. In 2021, a bacterium was isolated from the liver and kidneys of freshwater-farmed hybrid sturgeon in Yichang City, Hubei Province, causing a disease with high mortality and surface bleeding. Through morphological observation, 16S rDNA gene sequence analysis, pathogenicity, an antimicrobial sensitivity test, as well as serum physiological and biochemical analysis, it was identified as Staphylococcus saprophyticus and named E702. The 16S rDNA gene sequence of E702 is highly homologous to S. saprophyticus in GenBank. Phylogenetic analysis showed that E702 and S. saprophyticus clustered into one clade. The 50% lethal dose of E702 was 2.14 x 10(5) CFU/g. The percentages of monocytes and eosinophils were markedly increased in the diseased sturgeon's blood, whereas the percentages of platelets and lymphocytes were decreased. The activity levels of aspartate aminotransferase, alanine aminotransferase and alkaline phosphatase in the diseased fish were significantly increased. The diseased fish suffered obvious damage to many tissues and organs, especially the liver and kidney, showing swelling, hyperemic and inflammatory cell infiltration. E702 was sensitive to antibiotics such as neomycin, cefazolin, norfloxacin, carbenicillin, gentamicin and ciprofloxacin. The study not only proved that S. saprophyticus was responsible for a great deal of hybrid sturgeon deaths, but also shed light on its potential risks in hybrid sturgeon farming. The research results provided the theoretical basis for the diagnosis as well as prevention of this disease.
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