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Applied and Environmental Microbiology, November 2008, p. 6892-6897, Vol. 74, No. 22
0099-2240/08/$08.00+0     doi:10.1128/AEM.00853-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Emergence of Novel Streptococcus iniae Exopolysaccharide-Producing Strains following Vaccination with Nonproducing Strains {triangledown} ,{dagger}

Marina Eyngor,1 Yoram Tekoah,2 Roni Shapira,1 Avshalom Hurvitz,3 Amir Zlotkin,4 Avishay Lublin,5 and Avi Eldar5*

Institute of Biochemistry, Food Science and Nutrition, Faculty of Agricultural, Food and Environmental Quality Sciences, The Hebrew University of Jerusalem, Rehovot 76100, Israel,1 The Center for Glycobiology and the Department of Biotechnology Engineering, Faculty of Engineering, Ben Gurion University of the Negev, Beer-Sheva 84105, Israel,2 Dan Fish Farms, Kibbutz Dan, Upper Galilee 12245, Israel,3 Unit of Infectious Diseases, Sheba Medical Center, Tel Hashomer 52621, Israel,4 Department of Poultry and Fish Diseases, The Kimron Veterinary Institute, Bet Dagan 50250, Israel5

Received 15 April 2008/ Accepted 10 September 2008

Streptococcus iniae is a major pathogen of fish, producing fatal disease among fish species living in very diverse environments. Recently, reoccurrences of disease outbreaks were recorded in rainbow trout (Oncorhynchus mykiss, Walbaum) farms where the entire fish population was routinely vaccinated. New strains are distinguished from previous strains by their ability to produce large amounts of extracellular polysaccharide that is released into the medium. Present findings indicate that the extracellular polysaccharide is a major antigenic factor, suggesting an evolutionary selection of strains capable of extracellular polysaccharide production.

* Corresponding author. Mailing address: Department of Poultry and Fish Diseases, The Kimron Veterinary Institute, POB 12, Bet Dagan 50250, Israel. Phone: 972-3-9681760. Fax: 972-3-9681739. E-mail: eldar{at}agri.huji.ac.il

{triangledown} Published ahead of print on 19 September 2008.

{dagger} Supplemental material for this article may be found at http://aem.asm.org/.

Applied and Environmental Microbiology, November 2008, p. 6892-6897, Vol. 74, No. 22
0099-2240/08/$08.00+0     doi:10.1128/AEM.00853-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.





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