   \+                     Polymyxin B       00.00 ± 0.00    0.00 ± 0.00   **0.0.00 ± 0.00**   Colistin                                        00.00 ± 0.00                                                                    0.00 ± 0.00            **0.00 ± 0.00**                                    *E coli* 