Table 1 Prevalence of resistance genes among 124 S. aureus isolates from bulk tank milk of 189 U.S. dairy farms
Antibiotic class | Resistance genes | Number of isolates (%) |
|---|---|---|
Aminoglycoside | aadD | 1 (0.8) |
| Â | ant(6)-la | 2 (1.6) |
|  | aph(3′)-la | 18 (14.5) |
|  | aph(3′)-III | 2 (1.6) |
Beta - lactam | blaZ | 5 (4.0) |
| Â | mec(A) | 1 (0.8) |
Fluoroquinolone | norA | 123 (99.2) |
Lincosmaide | lnu(A) | 1 (0.8) |
Macrolide | erm(B) | 1 (0.8) |
| Â | mph(C) | 2 (1.6) |
Macrolide,Lincosamide & Streptogramin B | msrA | 3 (2.4) |
Phenicol | fexA | 4 (3.2) |
Tetracycline | tet(K) | 2 (1.6) |
| Â | tet(L) | 1 (0.8) |
| Â | tet(M) | 1 (0.8) |