一种新的对虾病原菌(普通变形菌)   总被引：8，自引：1，他引：8  

许兵  纪伟尚  徐怀恕 《水产学报》1992,16(2):130-136

1989年9月青岛崂山区上马镇养虾场部分虾池中流行红腿病。自垂死病虾体内分离出多株细菌,其中二株经感染健康成虾得到与病虾相同症状,证明所分离菌是对虾红腿病病原菌。经 63项形态及生理生化特性鉴定为普通变形菌(Protetus oulgaris Hauser)。中国对虾养成期红腿病系由条件致病菌所致,其作用部位在对虾血淋巴并引起血淋巴混浊、变稀、凝固能力下降。该病的实质是由于细菌侵入对虾循环系统而导致的败血症。  相似文献   

斑点叉尾暴发性败血症病原的分离与鉴定   总被引：4，自引：2，他引：4  

苏应兵  邹桂伟  袁科平  郑蓓蓓  艾晓辉 《淡水渔业》2006,36(5)

从3尾表现出血症状的患病斑点叉尾鱼回(Ictalurus Punctatus)体内各分离出一株病菌,测定结果显示致其急性死亡的致病菌为温和气单胞菌(Aerom onas sobria),慢性死亡的致病菌分别为嗜水气单胞菌(A.hydrophila)和温和气单胞菌(A.sobria)。药敏试验结果表明:3株菌对广谱抗生素如氨苄青霉素、青霉素、先锋霉素Ⅵ和红霉素等已产生耐药性,而对菌必治、头孢肤肟和复达欣等高度敏感;菌株Jh-1和菌株Yh-3对复方新诺明、四环素、氟哌酸和丁胺卡那霉素高度敏感,而菌株Jh-2却低度敏感;环丙沙星和诺氟沙星对3株致病菌均具较好的抑菌、杀菌作用。  相似文献   

Meningoencephalomyelitis in a foal due to Salmonella agona infection     

JC Patterson-Kane  FT Bain  JM Donahue  LR Harrison 《New Zealand veterinary journal》2013,61(4):159-161

CASE HISTORY: A neonatal Thoroughbred foal was presented with rib fractures and left forelimb lameness secondary to dystocia.

CLINICAL FINDINGS: The foal developed a head tilt, seizures and watery diarrhoea during hospitalisation and died at 7 days of age. Histological examination of the brain and spinal cord revealed a suppurative meningoencephalomyelitis with vasculitis, and numerous intralesional, gram-negative bacilli. Similar microscopic lesions were noted in the lungs, renal medullary interstitium, and umbilicus. Bacilli in the brain, spinal cord and umbilicus were identified immunohistochemically as Salmonella group B. Salmonella agona was isolated in pure culture from the brain, lung, liver, kidney, and intestine.

CONCLUSION: This is the first report of meningoencephalomyelitis and septicaemia due to Salmonella infection in an equine neonate.  相似文献   

Comparative susceptibility among three stocks of yellow perch,Perca flavescens (Mitchill), to viral haemorrhagic septicaemia virus strain IVb from the Great Lakes     

W Olson  E Emmenegger  J Glenn  J Winton  F Goetz 《Journal of fish diseases》2013,36(8):711-719

The Great Lakes strain of viral haemorrhagic septicaemia virus IVb (VHSV‐IVb) is capable of infecting a wide number of naive species and has been associated with large fish kills in the Midwestern United States since its discovery in 2005. The yellow perch, Perca flavescens (Mitchill), a freshwater species commonly found throughout inland waters of the United States and prized for its high value in sport and commercial fisheries, is a species documented in several fish kills affiliated with VHS. In the present study, differences in survival after infection with VHSV IVb were observed among juvenile fish from three yellow perch broodstocks that were originally derived from distinct wild populations, suggesting innate differences in susceptibility due to genetic variance. While all three stocks were susceptible upon waterborne exposure to VHS virus infection, fish derived from the Midwest (Lake Winnebago, WI) showed significantly lower cumulative % survival compared with two perch stocks derived from the East Coast (Perquimans River, NC and Choptank River, MD) of the United States. However, despite differences in apparent susceptibility, clinical signs did not vary between stocks and included moderate‐to‐severe haemorrhages at the pelvic and pectoral fin bases and exophthalmia. After the 28‐day challenge was complete, VHS virus was analysed in subsets of whole fish that had either survived or succumbed to the infection using both plaque assay and quantitative PCR methodologies. A direct correlation was identified between the two methods, suggesting the potential for both methods to be used to detect virus in a research setting.  相似文献   

Serratia marcescens associated ampullary system infection and septicaemia in a bonnethead shark,Sphyrna tiburo (L.)     

A Camus  A Berliner  T Clauss  N Hatcher  D Marancik 《Journal of fish diseases》2013,36(10):891-895

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六须鲶暴发性败血症病原菌的分离与鉴定     

陈福艳  陈明  黄婷  张彬  杨家坚  雷爱莹  王瑞  梁万文 《大连水产学院学报》2011,26(1):63-67

从患暴发性败血症的六须鲶Silurus soldatovi身上分离到致病菌株（FY-024）,用常规细菌培养方法对其观察,并进行生理生化特性测试。结果表明,该致病菌均符合鲶爱德华氏菌Edwardsiella ictaluri特征。为了进一步确认该致病菌的分类地位,对其进行了16S rRNA基因序列分析、遗传距离距阵及系统发育树分析,共扩增出1 417 bp基因片段（GenBank登录号为GQ924477）。系统发育结果显示,菌株FY-024与鲶爱德华氏菌的16S rRNA基因同源性达99.6%～99.9%,聚为同一分支,进一步确认致病菌是鲶爱德华氏菌。药敏试验和毒力试验结果显示,菌株FY-024对环丙沙星、恩诺沙星药物高度敏感,按Reed和Muench氏法计算LD50=1.08×106 cfu/尾。  相似文献   

The in vitro efficacy of oxytetracycline against re‐isolated pathogenic Aeromonas hydrophila carrying the cytolytic enterotoxin gene through hybrid catfish,Clarias macrocephalus (Günther, 1864) × Clarias gariepinus (Burchell, 1822) in Thailand          下载免费PDF全文

Pongsaton Juntarut  Sanae Kaewnopparat  Damrongsak Faroongsarng  Sommai Chiayvareesajja 《Aquaculture Research》2018,49(5):1848-1857

Aeromonas hydrophila is a pathogen infecting farmed hybrid catfish, Clarias macrocephalus (Günther, 1864) × Clarias gariepinus (Burchell, 1822) which incurs substantial economic losses in Thailand. The study aimed at a genetic tracking of A. hydrophila infection and the in vitro assessment of the efficacy of antibiotics against its virulent strains. Five clinical strains from catfishes and Nile tilapia were employed. They were 3‐passage re‐isolated through healthy hybrid catfish and the cytolytic enterotoxin gene (AHCYTOEN) of individuals was traced. Each of the re‐isolates at a dose of ~6.67 × 10⁵ CFU/g was intraperitoneally injected into ~15 g‐healthy hybrid catfish and their pathogenicity were observed for 7 days. It was found that AHCYTOEN was carried over whereas typical signs of motile aeromonas septicaemia were found in the specimens. The bacterial strains of Nile tilapia origin did not induce mortality but those of catfish origins (80%–100% rate of mortality). The strains were susceptible to the tetracycline antibiotics, and oxytetracycline produced MIC₅₀ and MBC as low as 0.007–0.031 μg/ml and 1–8 μg/ml respectively. As oxytetracycline specifically inhibited pathogenic A. hydrophila in vitro, it is recommended that an appropriate dosage regimen of the drug should be established.  相似文献   

Walleye Sander vitreus (Mitchill) are relatively resistant to experimental infection with VHSV IVb and extant walleye strains vary in susceptibility          下载免费PDF全文

J Grice  A Reid  A Peterson  K Blackburn  L Tubbs  S Lord  P Huber  R Horricks  B Dixon  N C Bols  J S Lumsden 《Journal of fish diseases》2015,38(10):859-872

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Serodiagnosis of a viral haemorrhagic septicaemia virus infection          下载免费PDF全文

B J Kang  K J Kim  T J Kim 《Journal of fish diseases》2015,38(2):227-229

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Cathelicidins enhance protection of channel catfish,Ictalurus punctatus,and channel catfish ♀ × blue catfish,Ictalurus furcatus ♂ hybrid catfish against Edwarsiella ictaluri infection     

Rhoda Mae C. Simora  Shangjia Li  Nermeen Y. Abass  Jeffery S. Terhune  Rex A. Dunham 《Journal of fish diseases》2020,43(12):1553-1562

Cathelicidins are a class of antimicrobial peptides (AMPs) known to possess rapid and direct antimicrobial activities against a variety of microorganisms. Recently identified cathelicidins derived from alligator and sea snake were found to be more effective in inhibiting microbial growth than other AMPs previously characterized. The ability of these two cathelicidins along with the peptides, cecropin and pleurocidin, to protect channel catfish (Ictalurus punctatus, Rafinesque) and hybrid catfish (I. punctatus ♀ × blue catfish, Ictalurus furcatus, Valenciennes ♂) against Edwardsiella ictaluri, one of the most prevalent pathogens affecting commercial catfish industry, was investigated. Cathelicidin-injected fish (50 µg ml⁻¹ fish⁻¹) that were simultaneously challenged with E. ictaluri through bath immersion at a concentration of ~1 × 10⁶ CFU/ml had increased survival rates compared with other peptide treatments and the infected control. Bacterial numbers were also reduced in the liver and kidney of channel catfish and hybrid catfish in the cathelicidin treatments 24 hr post-infection. After 8 days of challenge, serum was collected to determine immune-related parameters such as bactericidal activity, lysozyme, serum protein, albumin and globulin. These immune-related parameters were significantly elevated in fish injected with the two cathelicidins as compared to other peptide treatments. These results indicate that cathelicidins derived from alligator and sea snake can stimulate immunity and enhance the resistance to E. ictaluri infection in channel catfish and hybrid catfish.  相似文献