TABLE 8.
Single and multidrug resistance patterns in enterococcal isolates from the irrigation return flows (IRFs) and background canal site (MLC).
| Resistance pattern | No. of antimicrobials | No. of drug classes |
No. of isolates |
|
| IRFs (n = 173) | MLC (n = 12) | |||
| Pan-susceptible | 0 | 0 | 15 | 1 |
| Lin | 1 | 1 | 71 | 4 |
| Nit | 1 | 1 | 18 | 3 |
| Tet | 1 | 1 | 1 | 0 |
| ChlLin | 2 | 2 | 1 | 0 |
| DapLin | 2 | 2 | 1 | 0 |
| LinNit | 2 | 2 | 15 | 1 |
| LinSyn | 2 | 2 | 30 | 1 |
| LinTet | 2 | 2 | 1 | 0 |
| LinTylt | 2 | 2 | 1 | 0 |
| NitSyn | 2 | 2 | 1 | 0 |
| NitTet | 2 | 2 | 7 | 0 |
| KanNitTet | 3 | 3* | 1 | 0 |
| LinNitTet | 3 | 3* | 5 | 2 |
| ChlLinSynTet | 4 | 4* | 1 | 0 |
| CipLinNitTet | 4 | 4* | 2 | 0 |
| LinNitPenStrTet | 5 | 4* | 1 | 0 |
| EryKanLinStrSynTetTylt | 7 | 6* | 1 | 0 |
Chl, chloramphenicol; Cip, ciprofloxacin; Dap, daptomycin; Ery, erythromycin; Kan, kanamycin; Lin, lincomycin; Lzd, linezolid; Nit, nitrofurantoin, Pen, penicillin; Str, streptomycin; Syn, quinupristin/dalfopristin; Tet, tetracyline; Tylt, tylosin tartrate; Pan-susceptible, susceptible to all antimicrobials tested.
*Denotes multidrug resistance based on resistance to antimicrobials in three or more drug classes.