Table 2.
Antimicrobial resistance patterns of S. aureus strains isolated from mastitis cows’ milk and their susceptibility to thymoquinone.
| Strain code No. |
Antimicrobial resistance pattern | NO. of drugs to which the strain was resistant | Thymo-quinone | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L | AMP | FEP | CTX | AZM | DA | DO | C | AMC | SXT | TOB | CN | TPZ | SAM | IZD (mm) | MIC µg/mL | ||
| MK1 | r | r | r | s | r | r | s | r | r | s | s | s | r | s | 8 | 50 | 12 |
| MK2 | r | r | r | s | s | s | s | s | s | s | s | s | s | s | 3 | 46 | 9 |
| MK3 | r | r | r | r | s | s | s | s | r | s | s | s | s | s | 5 | 40 | 9 |
| MK4 | r | r | r | r | r | r | r | s | s | s | s | s | s | s | 7 | 36 | 12 |
| MK5 | r | r | r | r | r | s | r | s | r | r | r | r | s | r | 11 | 46 | 8 |
| MK6 | r | r | r | r | r | r | s | r | s | s | s | r | s | s | 8 | 42 | 8 |
| MK7 | r | r | r | r | r | r | r | r | s | r | r | s | s | s | 10 | 22 | 6 |
| MK8 | r | r | s | r | r | r | r | s | s | r | r | s | s | s | 8 | 30 | 7 |
| MK9 | r | r | r | r | r | r | s | r | s | s | s | r | s | s | 8 | 23 | 7 |
| Resistance percentage | 100 | 100 | 88.9 | 77.8 | 66.7 | 44.4 | 33.3 | 11.1 | |||||||||
MK milk, r resistant, L lincomycin, AMP ampicillin, FEP cefepime, CTX cefotaxime, AZM azithromycin, DA clindamycin, DO doxycycline, C chloramphenicol, AMC amoxycillin/clavulanic acid, SXT trimethoprim/sulphamethoxazol, TOB tobramycin, CN gentamicin, TPZ tazobactam, SAM ampicillin/sulbactam, IZD inhibition zone diameter, MIC minimal inhibitory concentration, r resistant, s sensitive. Underlined strains were used for subsequent plasmid curing. All strains were sensitive to linezolid and ofloxacin.