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The paper presents a study of the prevalence of suilysin, MRP and EF protein encoding genes - considered to be important virulence factors in Streptococcus suis. Of the 63 strains included in the study, 44 were isolated from the tissues of streptococcosis affected pigs and 19 from the tonsils of healthy carrier animals. The suilysin gene was detected in 79% of the strains; mrp and ef genes were detected...
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