Emergence of Novel <i>Streptococcus iniae</i> Exopolysaccharide-Producing Strains following Vaccination with Nonproducing Strains

Abstract excerpt

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...

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