Table 1. Antibiotic resistant phenotype of 186 Escherichia coli isolates against 21 antimicrobial agents obtained from chicken and pork samples from the 6 districts, Beijing, China, 2020.
| Antimicrobial classes | Antimicrobial agents | Chicken | Pork | Overall R% § | |||||
| S% * | I% † | R% § | S% * | I% † | R% § | ||||
| Note: The six districts of Beijing includes Dongcheng, Xicheng, Haidian, Fengtai, Chaoyang, and Changping.
* S% means the percentage of isolates that were sensitive to a specific antimicrobial. † I% means the percentage of isolates that were intermediate resistant to a specific antimicrobial. § R% means the percent of isolates that were resistant to a specific antimicrobial. | |||||||||
| Aminoglycosides | Amikacin (AMI) | 94.9 | 1.5 | 3.7 | 100.0 | 0.0 | 0.0 | 2.9 | |
| Gentamicin (GEN) | 65.4 | 1.5 | 33.1 | 82.1 | 0.0 | 18.0 | 29.7 | ||
| Tobramycin (TOB) | 64.7 | 2.2 | 33.1 | 87.2 | 0.0 | 12.8 | 28.6 | ||
| Tetracyclines | Doxycycline (DOX) | 40.4 | 30.2 | 29.4 | 18.0 | 38.5 | 43.6 | 32.6 | |
| Tigecycline (TGC) | 98.5 | 0.0 | 1.5 | 94.9 | 0.0 | 5.1 | 2.3 | ||
| Minocycline (MIN) | 83.8 | 11.0 | 5.2 | 64.1 | 12.8 | 23.1 | 9.1 | ||
| Fluoroquinolones | Ciprofloxacin (CIP) | 69.1 | 1.5 | 29.4 | 79.5 | 2.6 | 18.0 | 26.9 | |
| Levofloxacin (LEVO) | 73.5 | 2.9 | 23.5 | 79.5 | 7.7 | 12.8 | 21.1 | ||
| Sulfonamides | Trimethoprim/sulfamethoxazole (SXT) | 14.0 | 0.0 | 86.0 | 7.7 | 0.0 | 92.3 | 87.4 | |
| Penicillins | Aztreonam (AZT) | 69.1 | 4.4 | 26.5 | 89.7 | 2.6 | 7.7 | 22.3 | |
| Carbapenems | Imipenem (IMI) | 91.9 | 3.7 | 4.4 | 94.9 | 2.6 | 2.6 | 4.0 | |
| Meropenem (MERO) | 94.1 | 2.9 | 2.9 | 97.4 | 0.0 | 2.6 | 2.9 | ||
| Doripenem (DOR) | 97.8 | 0.7 | 1.5 | 100.0 | 0.0 | 0.0 | 1.1 | ||
| Cephalosporins | Cefepime (FEP) | 80.9 | 4.4 | 14.7 | 97.4 | 0.0 | 2.6 | 12.0 | |
| Ceftazidime (TAZ) | 89.7 | 3.7 | 6.6 | 92.3 | 2.6 | 5.1 | 6.3 | ||
| Cefotaxime (FOT) | 66.2 | 2.2 | 31.6 | 92.3 | 0.0 | 7.7 | 26.3 | ||
| Lipopeptides | Colistin (COL) | 80.9 | 2.9 | 16.2 | 92.3 | 5.1 | 2.6 | 13.1 | |
| Polymixin B (POL) | 69.1 | 15.4 | 15.4 | 82.1 | 15.4 | 2.6 | 12.6 | ||
| β-lactam/β-lactam inhibitors | Ampicillin/sulbactam 2∶1 ratio (A/S2) | 66.2 | 11.8 | 22.1 | 74.4 | 20.5 | 5.1 | 18.3 | |
| Piperacillin/tazobactam constant 4 (P/T4) | 96.3 | 1.5 | 2.2 | 100.0 | 0.0 | 0.0 | 1.7 | ||
| Ticarcillin/clavulanic acid constant 2 (TIM2) | 67.7 | 27.2 | 5.2 | 76.9 | 20.5 | 2.6 | 4.6 | ||