Table 3. Frequency (number, and percentages in parenthesis) of Streptococcus agalactiae classified as susceptible (S) or resistant (R), according to the interpretation criteria described by the Clinical and Laboratory Standards Institute (CLSI, [28, 29]).
| Antimicrobial | CLSI criteria1 | RAPD-clusters | Overall | ||
|---|---|---|---|---|---|
| Ia (n = 35) | Ib (n = 32) | II (n = 19) | |||
| Ampicillin | R | - | - | 1 (5.3) | 1 (1.7) |
| S | 35 (100) | 32 (100) | 18 (94.7) | 85 (98.3) | |
| Ceftiofur | R | 2 (5.7) | - | - | 2 (2.3) |
| S | 33 (94.3) | 32 (100) | 19 (100) | 84 (97.7) | |
| Cephalothin | R | - | 2 (6.2) | 1 (5.3) | 3 (3.5) |
| S | 35 (100) | 30 (93.8) | 18 (94.7) | 83 (96.5) | |
| Erythromycin | R | 1 (2.9) | 22 (68.7) | 2 (10.6) | 25 (29.1) |
| S | 34 (97.1) | 10 (31.3) | 17 (89.4) | 61 (70.9) | |
| Oxacillin | R | - | 2 (6.2) | 1 (5.3) | 3 (3.5) |
| S | 35 (100) | 30 (93.8) | 18 (94.7) | 83 (96.5) | |
| Penicillin+Novobiocin | R | - | - | - | - |
| S | 35 (100) | 32 (100) | 19 (100) | 86 (100) | |
| Penicillin | R | 2 (5.7) | - | - | 2 (2.3) |
| S | 33 (94.3) | 32 (100) | 19 (100) | 84 (97.7) | |
| Pirlimycin | R | - | 14 (43.7) | - | 14 (16.3) |
| S | 35 (100) | 18 (56.3) | 19 (100) | 72 (83.7) | |
| Sulfadimethoxine | R | 1 (2.9) | - | - | 1 (1.7) |
| S | 34 (97.1) | 32 (100) | 19 (100) | 85 (98.3) | |
| Tetracycline | R | 26 (74.3) | 30 (93.7) | 3 (15.8) | 59 (68.6) |
| S | 9 (25.7) | 2 (6.3) | 16 (84.2) | 27 (31.4) | |
1S = susceptible
R = resistant.