FIG. 1.

Results of susceptibility testing of an A. ustus strain against ITC in the NCCLS and XTT methods, with data determined visually and spectophotometrically, after 24 h of incubation. The bars represent the growth levels obtained in the NCCLS_vis (dark bars) and XTT_vis (light bars) methods for each concentration on a scale of 0 (absence of growth or color) to 4 (no reduction of growth or color compared with the data for the drug-free control). The curves with the circles represent the OD at 450 nm (open symbols) and the relative OD (percentage) (closed symbols) obtained by the XTT_sp method. The curves with the triangles represent the OD at 405 nm (open symbols) and the relative OD (percentage) (closed symbols) obtained by the NCCLS_sp method.