Invasive ability of C. coli and C. jejuni isolates. Invasion of HCT-8 cells of C. coli (RC037, 430, 008, 013 and 026) and C. jejuni (RC039, 317, 188, 185 and 179) isolates. Statistical significance (Student t test) relative to the level of C. jejuni 12502 is indicated. The experiments were done in triplicate and on three separate occasions. The error bars represent standard deviations.