Table 5. Antibiotic sensitivity of Listeria monocytogenes strains isolated from slaughterhouses (n=15).
| Antibiotics | Strains isolated from slaughterhouse | Sensitivity of the isolates (n, %) 1) | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SMFM-SI-1 | SMFM-SI-2 | SMFM-SI-3 | SMFM-SI-4 | SMFM-SI-5 | SMFM-SI-6 | SMFM-SI-7 | SMFM-SI-8 | SMFM-SI-9 | SMFM-SI-10 | SMFM-SI-11 | SMFM-SI-12 | SMFM-SI-13 | SMFM-SI-14 | SMFM-SI-15 | Susceptible | Intermediate | Resistant | |
| Gentamycin | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | 15 (100) |
||
| Bacitracin | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | 15 (100) |
||
| Penicillin G | R | R | R | R | R | R | R | S | R | R | R | R | R | R | R | 1 (6.7) |
14 (93.3) |
|
| Tetracycline | S | S | S | S | S | S | S | S | R | S | S | S | R | R | S | 12 (80) |
3 (20) |
|
| Spectinomycin | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | 15 (100) |
||
| Kanamycin | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | 15 (100) |
||
| Erythro-mycin | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | 15 (100) |
||
| Tigecycline | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | 15 (100) |
||
| Ampicillin | S | I | I | S | S | I | S | S | S | R | S | R | R | R | I | 7 (46.6) |
4 (26.7) |
4 (26.7) |
| Strepto-mycin | I | R | R | R | I | R | R | I | I | I | R | R | R | R | I | 6 (40) |
9 (60) |
|
| Chloram-phenicol | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | 15 (100) |
||
| Rifampicin | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | 15 (100) |
||
| Susceptible (n, %) |
10 (83.3) |
9 (75) |
9 (75) |
10 (83.3) |
10 (83.3) |
9 (75) |
10 (83.3) |
11 (91.7) |
9 (75) |
9 (75) |
11 (91.7) |
9 (75) |
8 (66.7) |
8 (66.7) |
9 (75) |
|||
| Intermediate (n, %) |
1 (8.3) |
1 (8.3) |
1 (8.3) |
0 | 1 (8.3) |
1 (8.3) |
0 | 1 (8.3) |
1 (8.3) |
1 (8.3) |
0 | 0 | 0 | 0 | 2 (16.7) |
|||
| Resistant (n, %) |
1 (8.3) |
2 (16.7) |
2 (16.7) |
2 (16.7) |
1 (8.3) |
2 (16.7) |
2 (16.7) |
0 | 2 (16.7) |
2 (16.7) |
1 (8.3) |
3 (25) |
4 (33.3) |
4 (33.3) |
1 (8.3) |
|||
According to CLSI guidelines using the breakpoints of Staphylococcus species resistance because no resistance criteria exist for Listeria susceptibility testing in the CLSI guidelines (Byrne et al., 2016).