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Tuesday, April 21, 2020

Complete genome sequence and characterization of virulence genes in Lancefield group C Streptococcus dysgalactiae isolated from farmed amberjack (Seriola dumerili).

Lancefield group C Streptococcus dysgalactiae causes infections in farmed fish. Here, the genome of S. dysgalactiae strain kdys0611, isolated from farmed amberjack (Seriola dumerili) was sequenced. The complete genome sequence of kdys0611 consists of a single chromosome and five plasmids. The chromosome is 2,142,780?bp long and has a GC content of 40%. It possesses 2061 coding sequences and 67 tRNA and 6 rRNA operons. One clustered regularly interspaced short palindromic repeat, 125 insertion sequences, and four predicted prophage elements were identified. Phylogenetic analysis based on 126 core genes suggested that the kdys0611 strain is more closely related to S. dysgalactiae…

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Tuesday, April 21, 2020

Complete Genome Sequence of Photobacterium damselae Subsp. damselae Strain SSPD1601 Isolated from Deep-Sea Cage-Cultured Sebastes schlegelii with Septic Skin Ulcer.

Photobacterium damselae subsp. damselae (PDD) is a Gram-negative bacterium that can infect a variety of aquatic organisms and humans. Based on an epidemiological investigation conducted over the past 3 years, PDD is one of the most important pathogens causing septic skin ulcer in deep-sea cage-cultured Sebastes schlegelii in the Huang-Bohai Sea area and present throughout the year with high abundance. To further understand the pathogenicity of this species, the pathogenic properties and genome of PDD strain SSPD1601 were analyzed. The results revealed that PDD strain SSPD1601 is a rod-shaped cell with a single polar flagellum, and the clinical symptoms were…

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Sunday, September 22, 2019

The genome sequence of a new strain of Mycobacterium ulcerans ecovar Liflandii, emerging as a sturgeon pathogen

Mycobacterium ulcerans ecovar Liflandii (MuLiflandii) is emerging as a non-mycobacterial pathogen in amphibians. Here, we make the first report on the prevalence of a new strain of MuLiflandii infection in Chinese sturgeon. All the diseased fish showed the classic clinical symptoms of ascites and/or muscle ulceration. A new slow-growing and acid-fast bacillus ASM001 strain was obtained from the ascites of infected fish; this strain demonstrated pathogenicity when tested in hybrid sturgeon. The complete genome sequence of MuLiflandii ASM001 is a circular chromosome of 6,167,296?bp, with a G?+?C content of 65.57%, containing 4518 predicted coding DNA sequences and 999 pseudo-genes, 3…

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Sunday, September 22, 2019

Isolation, functional characterization and transmissibility of p3PS10, a multidrug resistance plasmid of the fish pathogen Piscirickettsia salmonis.

Antibiotic resistance is a major public health concern due to its association with the loss of efficacy of antimicrobial therapies. Horizontal transfer events may play a significant role in the dissemination of resistant bacterial phenotypes, being mobilizable plasmids a well-known mechanism. In this study, we aimed to gain insights into the genetics underlying the development of antibiotic resistance by Piscirickettsia salmonis isolates, a bacterial fish pathogen and causative agent of salmonid piscirickettsiosis, and the main target of antibiotics used in Chilean salmon farming. We provide experimental evidence that the plasmid p3PS10, which harbors multidrug resistance genes for chloramphenicol (cat2), tetracyclines…

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Saturday, September 21, 2019

Multi-Locus Variable number of tandem repeat Analysis (MLVA) of Yersinia ruckeri confirms the existence of host-specificity, geographic endemism and anthropogenic dissemination of virulent clones.

A Multi-Locus Variable number of tandem repeat Analysis (MLVA) assay was developed for epizootiological study of the internationally significant fish pathogen Yersinia ruckeri, which causes yersiniosis in salmonids. The assay involves amplification of ten Variable Number of Tandem Repeat (VNTR) loci in two five-plex PCR reactions, followed by capillary electrophoresis. A collection of 484 Y. ruckeri isolates, originating from various biological sources and collected from four continents over seven decades, was analysed. Minimum spanning tree cluster analysis of MLVA profiles separated the studied population into nine major clonal complexes, and a number of minor clusters and singletons. The major clonal…

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Sunday, July 7, 2019

Genome sequences of Shewanella baltica and Shewanella morhuae strains isolated from the gastrointestinal tract of freshwater fish.

We present here the genome sequences of Shewanella baltica strain CW2 and Shewanella morhuae strain CW7, isolated from the gastrointestinal tract of Salvelinus namaycush (lean lake trout) and Coregonus clupeaformis (whitefish), respectively. These genome sequences provide insights into the niche adaptation of these specific species in freshwater systems. Copyright © 2018 Castillo et al.

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Sunday, July 7, 2019

Complete genome sequence of the virulent Aeromonas salmonicida subsp. masoucida strain RFAS1.

Here, we report the complete genome sequence of the pathogenic Aeromonas salmonicida subsp. masoucida strain RFAS1, isolated from black rockfish and showing signs of furunculosis. Sequencing with the PacBio platform yielded a circular chromosome of 4,783,004?bp and two plasmids (70,968?bp and 63,563?bp) harboring 4,411, 67, and 71 protein-coding genes, respectively. Copyright © 2018 Kim et al.

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