Tuesday, February 27, 2007
Shewanella infection in decompensated liver disease: a septic case.
J Gastroenterol. 2007 Jan
Department of Internal Medicine, Karatsu Red Cross Hospital, 1-5-1 Futago, Karatsu, Saga, 847-8588, Japan.
Shewanella species are an unusual cause of disease in humans. However, reports of Shewanella infections have been increasing, and hepatobiliary disease has been proposed as a predisposing factor following a critical course. We report the first Japanese septic case of decompensated liver disease in which this bacterium acted as a definite pathogen. A 67-year-old Japanese man with primary sclerosing cholangitis was admitted to our hospital complaining of fever, general fatigue, pain, and a rash on the lower left extremity. He was tentatively diagnosed with necrotizing fasciitis caused by Vibrio vulnificus because of his decompensated cirrhotic liver and history of consuming raw fish. Thereafter, the diagnosis was altered to cellulitis and Shewanella septicemia on the basis of the characteristics of his skin lesion and an arterial blood culture. He died of multiple organ failure on the eleventh day in the hospital. Since several reports have demonstrated that Shewanella can cause lethal sepsis in patients with hepatobiliary disease, we should be aware of the pathogenicity of this bacterium.
PMID: 17322999 Pub Med
Description of Shewanella glacialipiscicola sp. nov. and Shewanella algidipiscicola sp. nov., isolated from marine fish of the Danish Baltic Sea, and proposal that Shewanella affinis is a later heterotypic synonym of Shewanella colwelliana.
Int J Syst Evol Microbiol. 2007 Feb
National Research Institute of Fisheries Science, Fisheries Research Agency, 2-12-4 Fukuura, Kanazawa-ku, Yokohama 236-8648, Japan.
Two novel species belonging to the genus Shewanella are described on the basis of a polyphasic taxonomic approach. A total of 40 strains of Gram-negative, psychrotolerant, H(2)S-producing bacteria were isolated from marine fish (cod and plaice) caught in the Baltic Sea off Denmark. Strains belonging to group 1 (seven strains) were a lactate-assimilating variant of Shewanella morhuae with a G+C content of 44 mol%. The strains of group 2 (33 strains) utilized lactate, N-acetylglucosamine and malate but did not produce DNase or ornithine decarboxylase. Their G+C content was 47 mol%. Phylogenetic analysis of the 16S rRNA gene sequence data placed the two novel species within the genus Shewanella. Group 1 showed greatest sequence similarity with S. morhuae ATCC BAA-1205(T) (99.9 %). However, gyrB gene sequence analysis and DNA-DNA hybridization differentiated these isolates from S. morhuae, with 95.6 % sequence similarity and less than 57 % DNA relatedness, respectively. Group 2 strains shared more than 99 % 16S rRNA gene sequence similarity with the type strains of Shewanella colwelliana and Shewanella affinis, but gyrB sequence similarity ( approximately 85 %) and the results of DNA hybridization ( approximately 28 %) indicated that the new isolates represented a novel species. Furthermore, when compared to each other, the type strains of S. colwelliana and S. affinis had almost identical gyrB sequences and significantly high DNA reassociation values (76-83 %), indicating that they belonged to the same species. Based on the conclusions of this study, we propose the novel species Shewanella glacialipiscicola sp. nov. (type strain T147(T)=LMG 23744(T)=NBRC 102030(T)) for group 1 strains and Shewanella algidipiscicola sp. nov. (type strain S13(T)=LMG 23746(T)=NBRC 102032(T)) for group 2 strains, and we propose that Shewanella affinis as a later heterotypic synonym of Shewanella colwelliana.
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