Table 2.
Distribution of MIC's to several antibiotics among S. epidermidis isolated from mastitis and healthy women
| Percentage of strains for which the MIC (μg mL-1) was as follows: | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Antibiotics | Breast milk | N° of strains | ≤ 0.03 | 0.12 | 0.25 | 0.5 | 1 | 2 | 4 | 8 | > 8 | |
| PEN | H | 36 | 17 | 8 | 8 | 14 | 14 | 8 | 11 | 19 | ||
| M | 40 | 10 | 5 | 5 | 8 | 10 | 33 | 8 | 8 | 18 | ||
| AMP | ≤ 0.12 | 0.25 | 0.5 | 1 | 2 | 4 | 8 | 100 | > 100 | |||
| H | 36 | 19 | 6 | 17 | 22 | 8 | 8 | 6 | 14 | |||
| M | 40 | 15 | 8 | 5 | 23 | 20 | 10 | 5 | 13 | 3 | ||
| OXA | ≤ 0.25 | 0.5 | 1 | 2 | > 2 | |||||||
| H | 36 | 11 | 31 | 11 | 8 | 39 | ||||||
| M | 40 | 5 | 8 | 13 | 8 | 68 | ||||||
| CIP | ≤ 0.25 | 0.5 | 1 | 2 | > 2 | |||||||
| H | 36 | 47 | 39 | 8 | 6 | |||||||
| M | 40 | 30 | 38 | 18 | 3 | 13 | ||||||
| CHL | ≤ 8 | 16 | > 16 | |||||||||
| H | 36 | 75 | 17 | 8 | ||||||||
| M | 40 | 78 | 10 | 13 | ||||||||
| ERY | ≤ 0.25 | 0.5 | 1 | 2 | 4 | > 4 | ||||||
| H | 36 | 39 | 14 | 6 | 8 | 33 | ||||||
| M | 40 | 23 | 15 | 3 | 60 | |||||||
| CLI | ≤ 0.5 | 1 | 2 | > 2 | ||||||||
| H | 36 | 81 | 8 | 3 | 8 | |||||||
| M | 40 | 70 | 3 | 28 | ||||||||
| TET | ≤ 4 | 8 | > 8 | |||||||||
| H | 36 | 56 | 19 | 25 | ||||||||
| M | 40 | 68 | 8 | 25 | ||||||||
| VAN | ≤ 0.5 | 1 | 2 | 4 | 8 | 16 | ≥ 16 | |||||
| H | 36 | 44 | 50 | 6 | ||||||||
| M | 40 | 43 | 48 | 5 | 3 | 3 | ||||||
| MUP | ≤ 4 | 256 | > 256 | |||||||||
| H | 36 | 78 | 11 | 11 | ||||||||
| M | 40 | 58 | 13 | 30 | ||||||||
H: strains isolated from healthy women; M: strains isolated from mastitis-suffering women; PEN: penicillin; AMP: ampicillin; OXA: oxacillin; CIP: ciprofloxacin; CHL: chloramphenicol; ERY: erythromycin; CLI: clindamycin; TET: tetracycline; VAN: vancomycin; MUP: mupirocin.
Statistically-significant differences between isolates from mastitis and healthy women are in bold.