FIG 4.
Stx2 levels and percentages of C600 after coincubation of clade 8 strains with C600. Clade 8 strains carrying genes for stx2 (PA2, PA8, PA9, PA19, and PA25) or stx2 and stx2c (PA3, PA13, and PA28) were cocultured with C600 for 16 h. (A) Stx2 levels quantified from the cocultured samples demonstrated that PA2 and PA8 significantly (P < 0.01) amplified Stx2a in comparison to monoculture controls. (B) The cell count for C600 relative to that for O157:H7 showed that during coculture, PA8 reduced the number of C600 colonies to the same extent as PA2. The error bars indicate SEM.