TABLE 2.
Minimum inhibitory concentrations (MIC) and minimum bactericidal concentrations (MBC) of a commercial quaternary ammonium compound sanitizer (cQAC) for wild-type (WT) and cQAC-adapted (qAD; 3 ppm) L. monocytogenes strains in the absence or presence of reserpine (+R).
| Isolate no. | Concentration (ppm)a |
|||
| WTb | WT + Rc | qAD | qAD + R | |
| WRLP354 | ||||
| MICb | 2 | <1 | 3 | 2 |
| MBCb | 3 | 3 | 4 | 3 |
| WRLP380 | ||||
| MIC | 2 | <1 | 3 | 2 |
| MBC | 3 | 3 | 4 | 3 |
| WRLP394 | ||||
| MIC | 2 | <1 | 3 | 2 |
| MBC | 3 | 3 | 4 | 3 |
| WRLP483 | ||||
| MIC | 2 | <1 | 3 | 2 |
| MBC | 3 | 3 | 4 | 3 |
| WRLP530 | ||||
| MIC | 2 | <1 | 3 | 2 |
| MBC | 3 | 3 | 4 | 3 |
| WRLP533 | ||||
| MIC | 2 | <1 | 3 | 2 |
| MBC | 3 | 3 | 4 | 3 |
aManufacturer recommended concentration (MRC) for the cQAC is 200 ppm.
bReported MIC and MBC tested in stepwise increments over three biological replicates.
cIn the presence of reserpine, WT isolates did not grow at the lowest dose of 1 ppm cQAC.