Table 5. Distribution of antimicrobial resistance, virulence-associated genes and serotypes among Streptococcus suis isolates (n=240) from pigs in Korea.
| Antimicrobials | No. of isolatesa) | No. of isolatesb) | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| epf+ | mrp+ | sly+ | 1 | 2 | 1/2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 14 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 28 | 29 | 33 | aa | nt | ||
| Ampicillin | 2 | 4 | 8c) | 1 | 2 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 3 | |
| Ceftiofur | 1 | 2 | 5 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 3 | |
| Chloramphenicol | 1 | 9c) | 16 | 0 | 4 | 0 | 2 | 1 | 1 | 0 | 1 | 2 | 2 | 0 | 1 | 1 | 0 | 0 | 1 | 2 | 1 | 0 | 0 | 0 | 1 | 2 | 0 | 1 | 7 | |
| Enrofloxacin | 3 | 8 | 13 | 0 | 2 | 1 | 2 | 1 | 0 | 0 | 1 | 1 | 2 | 0 | 0 | 1 | 0 | 0 | 1 | 2 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 6 | 4 | |
| Erythromycin | 9 | 120c) | 82 | 1 | 35c) | 7c) | 38c) | 10 | 3 | 1 | 9 | 6 | 14 | 3 | 6 | 1 | 1 | 2 | 3 | 6 | 3 | 3 | 1 | 0 | 2 | 7 | 2 | 25 | 22 | |
| Florfenicol | 3 | 38 | 28 | 0 | 7 | 2 | 14 | 5 | 2 | 1 | 2 | 0 | 4 | 2 | 2 | 0 | 0 | 0 | 2 | 2 | 1 | 0 | 0 | 0 | 1 | 2 | 1 | 10 | 11 | |
| Tetracycline | 9 | 132 | 87 | 1 | 36 | 16 | 38 | 10 | 3 | 3 | 8 | 7 | 14 | 3 | 6 | 1 | 1 | 2 | 3 | 6 | 3 | 4 | 1 | 1 | 2 | 7 | 2 | 31 | 25 | |
| Tiamulin | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
a) Number of resistance isolates with respect to expression of the virulence-associated gene, b) Number of resistance isolates with respect to serotypes of Streptococcus suis; aa, Auto-agglutinated; nt, Non-typable, c) Significantly different, P<0.05.