EditoriaL EditoriaL Yersinia ruckeri is a gram-negative rod-shaped bacterium belonging to the family Enterobacteriaceae. It is in the same genus as Yersinia pestis, the causative agent of the bubonic plaque and a category A select agent. The taxonomic assignment of Y. ruckeri, however, has raised controversy since it appears to have diverged from the rest of the Yersinia genus in phylogenetic a...

Yersinia spp. are animal pathogens, some of which cause human disease. We sequenced 10 Yersinia isolates (from six species: Yersinia enterocolitica, Y. fredericksenii, Y. kristensenii, Y. pestis, Y. pseudotuberculosis, and Y. ruckeri) to high-quality draft or complete status. The genomes range in size from 3.77 to 4.94 Mbp.

Yersinia ruckeri is the etiologic agent of enteric red mouth disease (ERM), a severe fish disease prevailing in worldwide aquaculture industries. Here we report for the first time the complete genome of Y. ruckeri (Yersinia ruckeri) SC09, a highly virulent strain isolated from Ictalurus punctatus with severe septicemia. SC09 possesses a single chromosome of 3,923,491 base pairs, which contains ...

An in vitro assay was used to study the involvement of gill cells in the trapping and processing of particulate antigens. Gills were routinely processed for light microscopy after being placed in medium containing either Yersinia ruckeri O-antigen-labelled fluorescent beads, unlabelled fluorescent beads, Y, ruckeri O-antigen or formalin-killed Y. ruckeri, for 0, 30 s, 1, 5 and 30 min. Y. rucker...

A polyphasic characterization of atypical isolates of Yersinia ruckeri (causative agent of enteric redmouth disease in trout) obtained from hatchery-reared brown trout Salmo trutta in South Carolina was performed. The Y. ruckeri isolates were biochemically and genetically distinct from reference cultures, including the type strain, but were unequivocally ascribed to the species Y. ruckeri, base...

from the winter 2002 to spring 2006, 126 moribund rainbow trout with clinical signs of external body haemorrhages around and within the oral cavity were sampled from 10 rainbow trout farms situated in the northwest and west of fars province, iran and examined for the detection and identification of yersinia ruckeri, the causative agent of enteric redmouth disease. fish kidneys were cultured ase...

Here we demonstrate that flagellar secretion is required for production of secreted lipase activity in the fish pathogen Yersinia ruckeri and that neither of these activities is necessary for virulence in rainbow trout. Our results suggest a possible mechanism for the emergence of nonmotile biotype 2 Y. ruckeri through the mutational loss of flagellar secretion.

Yersinia ruckeri is a gram-negative pathogen causing enteric redmouth disease in salmonids. Previous studies have reported that Y. ruckeri harbors an ampC gene that is expressed at low level. In this present work, the entire ampC gene of Y. ruckeri was cloned and expressed in Escherichia coli. The AmpC enzyme confers resistance to aminopenicillins and narrow-spectrum cephalosporins, which fit w...

UNLABELLED Yersinia ruckeri is the etiological agent of enteric redmouth (ERM) disease of farmed salmonids. Enteric redmouth disease is traditionally associated with rainbow trout (Oncorhynchus mykiss, Walbaum), but its incidence in Atlantic salmon (Salmo salar) is increasing. Yersinia ruckeri isolates recovered from diseased Atlantic salmon have been poorly characterized, and very little is kn...