TABLE 1.
Antimicrobial resistance phenotypes of Salmonella Newport isolates from different animal and food types
| Antimicrobial agent | Resistance breakpointa | % Resistant isolates (n)
|
|||||||
|---|---|---|---|---|---|---|---|---|---|
| Human (n = 20) | Cattle (n = 20) | Swine (n = 13) | Chicken (n = 10) | Turkey (n = 8) | Ground turkey (n = 7) | Pork chop (n = 3) | Total (n = 81) | ||
| Ampicillin | ≥32 | 50 (10) | 80 (16) | 54 (7) | 40 (4) | 13 (1) | 14 (1) | 100 (3) | 52 |
| Amoxicillin/clavulanic acid | ≥32 | 50 (10) | 80 (16) | 54 (7) | 30 (3) | 0 | 14 (1) | 100 (3) | 49 |
| Cefoxitin | ≥32 | 50 (10) | 80 (16) | 54 (7) | 30 (3) | 0 | 14 (1) | 100 (3) | 49 |
| Cephalothin | ≥32 | 50 (10) | 80 (16) | 54 (7) | 40 (4) | 0 | 14 (1) | 100 (3) | 51 |
| Ceftiofur | ≥8 | 50 (10) | 80 (16) | 54 (7) | 30 (3) | 0 | 14 (1) | 100 (3) | 49 |
| Ceftriaxone | ≥64 | 5 (1) | 5 (1) | 0 | 0 | 0 | 0 | 0 | 3 |
| Chloramphenicol | ≥32 | 50 (10) | 85 (17) | 46 (6) | 40 (4) | 0 | 14 (1) | 100 (3) | 51 |
| Tetracycline | ≥16 | 50 (10) | 95 (19) | 62 (8) | 40 (4) | 0 | 14 (1) | 100 (3) | 56 |
| Amikacin | ≥32 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Kanamycin | ≥64 | 5 (1) | 40 (8) | 23 (3) | 20 (2) | 13 (1) | 0 | 0 | 19 |
| Gentamicin | ≥16 | 0 | 20 (4) | 15 (2) | 10 (1) | 13 (1) | 14 (1) | 0 | 11 |
| Streptomycinb | ≥64 | 50 (10) | 90 (18) | 62 (8) | 40 (4) | 0 | 14 (1) | 100 (3) | 56 |
| Sulfamethoxazole | ≥512 | 50 (10) | 90 (18) | 62 (8) | 40 (4) | 13 (1) | 29 (2) | 100 (3) | 57 |
| Trimethoprim/sulfamethoxazole | ≥4 | 30 (6) | 15 (3) | 15 (2) | 0 | 0 | 14 (1) | 67 (2) | 17 |
| Nalidixic acid | ≥32 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Ciprofloxacin | ≥4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |