Emergence of novel Streptococcus iniae exopolysaccharide-producing strains following vaccination with nonproducing strains

Applied and Environmental Microbiology
Marina EyngorAvi Eldar


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.


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Related Concepts

Oncorhynchus mykiss antigen
Pathogenic Organism
Streptococcus iniae
Polysaccharides, Bacterial
Streptococcal Infections
Fish Diseases
Streptococcal Vaccines
Cabeza Acerada

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