Table 4.
Differences of MICs of polymyxin B and colistin on different plate materials.
| Tested Agents | Strains | rBMD | AD | ||||
|---|---|---|---|---|---|---|---|
| TC-PS | GB | nTC-PS | TC Plates | GA | nTC Plates | ||
| PMB | E. coli ATCC 25922 | 2 | 0.5 | 1 | 2 | 1 | 1 |
| E. coli ATCC 2469 | 2 | 0.5 | 0.5 | 1 | 0.5 | 1 | |
| K. pneumoniae ATCC 700603 | 4 | 0.5 | 0.5 | 2 | 1 | 1 | |
| K. pneumoniae ATCC 2146 | 4 | 0.5 | 0.5 | 2 | 1 | 1 | |
| A. baumannii ATCC 19606 | 2 | 0.5 | 0.5 | 1 | 0.5 | 1 | |
| P. aeruginosa ATCC 27853 | 2 | 0.5 | 1 | 2 | 1 | 2 | |
| CST | E. coli ATCC 25922 | 2 | 1 | 1 | 1 | 0.5 | 1 |
| E. coli ATCC 2469 | 2 | 0.5 | 0.5 | 1 | 0.5 | 0.5 | |
| K. pneumoniae ATCC 700603 | 4 | 0.5 | 0.5 | 1 | 0.5 | 1 | |
| K. pneumoniae ATCC 2146 | 2 | 0.5 | 0.5 | 1 | 0.5 | 1 | |
| A. baumannii ATCC 19606 | 2 | 1 | 1 | 1 | 0.5 | 0.5 | |
| P. aeruginosa ATCC 27853 | 2 | 1 | 1 | 2 | 1 | 1 | |
PMB: polymyxin B; CST: colistin; TC-PS: tissue-culture-treated polystyrene microtiter plates; GB: glass-bottom microtiter plates; nTC-PS: non-tissue-culture-treated polystyrene microtiter plates; TC plates: tissue-culture-treated polystyrene plates; GA: glass plates; nTC plates: non-tissue culture-treated polystyrene plates; rBMD: reference broth microdilution; AD: agar dilution.