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Comparison of cytotoxic effects of individual C. difficile strains, E. faecalis, and co-culture of E. faecalis with C. difficile on HT-29 cells. (A) HT-29 monolayer cells. (B–D) HT-29 cells treated with the cell-free supernatant from toxigenic C. difficile strain and E. faecalis. (E, F) HT-29 cells treated with the cell-free supernatant from co-culture of E. faecalis and C. difficile.
