Table 6.
Percentage of E. coli, Shigella spp., and Salmonella isolates harboring at least one ARD to each of 11 classes of antimicrobial compounds.
| Antimicrobial Class | Geographic Location | ||||
|---|---|---|---|---|---|
| USA | Cambodia | Egypt | Peru | Kenya | |
| β-Lactams | 50.0 | 42.1 | 88.5 | 47.1 | 65.2 |
| Aminoglycosides | 77.3 | 52.6 | 100.0 | 88.2 | 95.7 |
| Macrolides | 54.5 | 31.6 | 80.8 | 52.9 | 47.8 |
| Tetracyclines | 95.4 | 94.7 | 92.3 | 88.3 | 70.0 |
| Ansamycins | nd ** | nd | nd | 5.9 | nd |
| Phenicols | 81.8 | 63.2 | 80.8 | 64.7 | 47.8 |
| Quinolones | nd | 10.5 | 7.7 | nd | 4.3 |
| Quaternary amines | 22.7 | nd | 26.9 | 47.1 | 21.7 |
| Streptothricins | 13.6 | 10.5 | 42.3 | 1.8 | 17.4 |
| Sulfonamides | 63.6 | 47.4 | 73.1 | 82.4 | 95.7 |
| Trimethoprim | 31.8 | 26.3 | 69.2 | 70.6 | 78.3 |
| Class 1 integron * | 18.2 | n/a *** | 19.2 | 47.1 | 17.4 |
| Class 2 integron * | 9.1 | n/a | 34.7 | 5.9 | 13.0 |
* confirmed by intI1- and intI2-specific PCRs; ** not detected; *** not available for PCR confirmation.