Table 4 Carriage of resistance genetic elements among 1327 E. coli exhibiting resistance to different classes of antimicrobials
Classes of antimicrobials to which host strains were resistanta | ||||||
|---|---|---|---|---|---|---|
Combinations of genetic elements | Isolates positive for genetic elements | % among 1327 isolates | 0 | 1 ≤ 2 | 3 ≤ 5 | 6-8 |
Integrons | 464 | 35 | 0 | 37 (8) | 65 (14) | 362 (78) |
ISCR1 | 199 | 15 | 0 | 0 | 18 (9) | 181 (91) |
ISEcp1 | 128 | 10 | 0 | 0 | 35 (27) | 93 (73) |
IS26 | 86 | 7 | 0 | 0 | 12 (14) | 74 (86) |
Tn21 | 289 | 22 | 0 | 18 (6) | 33 (11) | 238 (83) |
Tn7 | 3 | <1 | 0 | 0 | 1 (25) | 2 (75) |
Combination of genetic elements in same isolate | ||||||
Integron + ISCR1 + Tn21 | 38 | 3 | 0 | 0 | 2 (5) | 36 (95) |
Integron + ISCR1 + IS26 | 28 | 2 | 0 | 0 | 2 (7) | 26 (93) |
Integron + ISCR1 + ISEcp1 + Tn21 | 16 | 1 | 0 | 0 | 0 | 16 (100) |
No genetic element detected | 332 | 35 | 307 (93) | 25 (6) | 0 | 0 |