文献类型： 外文期刊
作者： Xiao, Zidong 1 ; Cheng, Mengmeng 1 ; Hu, Xiaowei 1 ; Xue, Mingyang 1 ; Jiang, Nan 1 ; Liu, Wei 1 ; Fan, Yuding 1 ; Meng, Yan 1 ; Xu, Chen 1 ; Zhou, Yong 1 ;
作者机构： 1.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Wuhan, Peoples R China
2.Shanghai Ocean Univ, Coll Fisheries & Life Sci, Shanghai, Peoples R China
3.Henan Normal Univ, Coll Fisheries, Dept Fisheries Dev, Xinxiang, Henan, Peoples R China
关键词： Chinese softshell turtle; Trionyx sinensis; histopathology; bacterial load; bacterial toxin; gut microbiota
期刊名称：VETERINARY QUARTERLY （ 影响因子：6.4； 五年影响因子：5.2 ）
ISSN： 0165-2176
年卷期： 2023 年 43 卷 1 期
页码：
收录情况： SCI
摘要： An outbreak of a disease with a high mortality rate occurred in a Chinese Softshell Turtle (Pelodiscus sinensis) farm in Hubei Province. This study isolated a highly pathogenic Bacillus cereus strain (Y271) from diseased P. sinensis. Y271 has beta hemolysis, containing both Hemolysin BL (hblA, hblC, and hblD), Non-hemolytic enterotoxin, NHE (nheA, nheB, and nheC), and Enterotoxin FM (entFM) genes. Y271 is highly pathogenic against P. sinensis with an LD50 = 6.80x10(3) CFU/g weight. B. cereus was detected in multiple tissues of the infected P. sinensis. Among them, spleen tissue showed the highest copy number density (1.54 +/- 0.12x10(4) copies/mg). Multiple tissues and organs of diseased P. sinensis exhibited significant pathological damage, especially the spleen, liver, kidney, and intestine. It showed obvious tissue structure destruction, lesions, necrosis, red blood cells, and inflammatory cell infiltration. B. cereus proliferating in the spleen, liver, and other tissues was observed. The intestinal microbiota of the diseased P. sinensis was altered, with a greater abundance of Firmicutes, Fusobacterium, and Actinomyces than in the healthy group. Allobaculum, Rothia, Aeromonas, and Clostridium abundance were higher in the diseased group than in the healthy group. The number of unique microbial taxa (472) in the disease group was lower than that of the healthy group (705). Y271 was sensitive to multiple drugs, including florfenicol, enrofloxacin, neomycin, and doxycycline. B. cereus is the etiological agent responsible for the massive death of P. sinensis and reveals its potential risks during P. sinensis cultivation.
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