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Streptococcus suis ST7 epidemic strains show increased production of suilysin (sly) compared to non-epidemic strains. S. suis 05ZYH33 and 1940 (A) growth curves and (B) relative hemolytic activities, assessed in the supernatants collected at different time-points. (C) Sly protein concentration, determined by an enzyme-linked immunosorbent assay, performed on 11 ST7 strains and 8 non-epidemic strains listed in Table I.
