Table 2 Molecular characterization of antimicrobial resistance genotypes among APEC isolates
From: Genetic elements associated with antimicrobial resistance among avian pathogenic Escherichia coli
Antibiotic | Antimicrobial class | Number of resistance isolates | Associated genes tested | Number of positive isolates |
|---|---|---|---|---|
Ampicillin | Penicillins | 116 (100%) | bla TEM | 102 |
bla SHV | 0 | |||
bla oxa1 | 14 | |||
Chloramphenicol | Phenicols | 98 (84.5%) | cat1 | 86 |
cat2 | 4 | |||
cat3 | 0 | |||
cmlA | 8 | |||
cmlB | 0 | |||
Streptomycin | Aminoglycosides | 58 (50%) | strA-strB | 34 |
Ciprofloxacin | Quinolones | 48 (41.4%) | PMQRa | Â |
qnrA | 10 | |||
qnrB | 4 | |||
qnrS | 2 | |||
qnrD | 0 | |||
aac (6′)-Ib-cr | 0 | |||
QRDRb | Â | |||
S83L (gyrA) | 27 | |||
S83LÂ +Â D87Â N (gyrA) | 4 | |||
S80I (pyrC) | 1 | |||
Sulfamethoxazole-trimethoprim | Potentiated sulfonamides | 68 (58.6%) | sul1 | 23 |
sul2 | 39 | |||
sul3 | 0 | |||
Tetracycline | Tetracyclines | 108 (93.1%) | tetA | 50 |
tetB | 54 | |||
tetC | 0 | |||
tetD | 0 | |||
tetE | 0 | |||
tetG | 0 | |||
tetAÂ +Â tetB | 4 | |||
Kanamycin | Aminoglycosides | 80 (69.0%) | aphA1 | 65 |
aphA2 | 11 | |||
aphA1Â +Â aphA2 | 4 | |||
Cefotaxime (ESβL) | Cephalosporins | 68 (58.6%) | CTX-M (group 1) | 15 |
CTX-M (group 2) | 0 | |||
CTX-M (group 8) | 0 | |||
CTX-M (group 9) | 2 | |||
CTX-M (group 25) | 0 | |||
bla TEM | 20 | |||
bla SHV | 0 | |||
bla oxa1 | 7 | |||
CTX-M (group 1) + bla TEM | 24 |