Figure 1

Bacteria attached to the Caco-2 epithelial cell surface was enumerated after 3 h by subtracting the number of bacteria recovered following gentamicin protection assay at the same time interval, as described in Fig 2. Results are presented as the percentage of the inoculum associated. Data are means ± standard errors of two independent experiments performed in triplicate. E. coli K12 and S. Enteritidis were used as negative and positive controls, respectively.