Table 3.
Prevalence of the antimicrobial resistance genes among phenotypically resistant E. coli and among animals with resistant E. coli from dairy cattle.
| Antimicrobial Agent | Resistance Gene | Number (%) of Isolates with Resistance Genes | Number (%) of Animals with E. coli Positive for Resistance Genes |
|---|---|---|---|
| Cattle Barn | |||
| Ampicillin | n = 31 | n = 21 | |
| blaTEM | 6 (19.4) | 4 (19) | |
| blaSHV | 4 (12.9) | 3 (14.3) | |
| Streptomycin | n = 30 | n = 22 | |
| aadA1 | 10 (33.3) | 6 (27.3) | |
| Tetracycline | n = 35 | n = 20 | |
| tetA | 9 (25.7) | 5 (25) | |
| tetB | 1 (2.9) | 1 (5) | |
| tetC | 1 (2.9) | 1 (5) | |