Table 4.
Frequent resistance patterns in E. coli isolated from healthy pigs between 2010 and 2020 in Korea (n = 2542).
| No. of Antimicrobials |
Total No. of Isolates (%) |
Most Common Pattern (No. of Isolates) |
|---|---|---|
| 0 | 261 (10.3) | |
| 1 | 160 (6.3) | TET (n = 73) |
| 2 | 232 (9.1) | STR TET (n = 94) |
| 3 | 377 (14.8) | CHL STR TET (n = 92) |
| 4 | 579 (22.7) | AMP CHL STR TET (n = 305) |
| 5 | 480 (18.9) | AMP CHL STR TET SXT (n = 244) |
| 6 | 236 (9.3) | AMP CHL NAL STR TET SXT (n = 63) |
| 7 | 126 (5.0) | AMP CHL CIP NAL STR TET SXT (n = 56) |
| 8 | 64 (2.5) | AMP CHL CIP GEN NAL STR TET SXT (n = 45) |
| 9 | 20 (0.8) | AMP XNL CHL CIP GEN NAL STR TET SXT (n = 9) |
| 10 | 5 (0.2) | AMC AMP FOX CHL CIP GEN NAL STR TET SXT (n = 2) |
| AMP FOX XNL CHL CIP GEN NAL STR TET SXT (n = 2) | ||
| 11 | 2 (0.1) | AMC AMP FOX XNL CHL CIP GEN NAL STR TET SXT (n = 2) |
Abbreviations: AMC, amoxicillin/clavulanic acid; AMP, ampicillin; CHL, chloramphenicol; CIP, ciprofloxacin; COL, colistin; FOX, cefoxitin; GEN, gentamicin; NAL, nalidixic acid; STR, streptomycin; SXT, trimethoprim/sulfamethoxazole; TET, tetracycline; XNL, ceftiofur).