FIG. 4.

Neutralization of NadA-mediated E. coli adhesion to Chang cells by anti-NadA peptide Abs/Fab fragments. Adherence of E. coli NadA to Chang cells was inhibited by the addition of 45 nM (A) or increasing concentrations (B) of affinity-purified Abs/Fab fragments against the specified NadA peptide. Adhesion efficacy is expressed with respect to control sample (E. coli NadA infecting Chang cells in the absence of Ab/Fab fragments), arbitrarily fixed at 100. Data are the means ± standard deviations from several experiments run in triplicate.