Table 3.
Antimicrobial resistance in Salmonella isolates from broiler farms a
| Serovar (Serogroup) | N (%) | NAL | NEO | STR | TET | AZM | XNL | FOX | AMP | SXT | COL | FFN | > 1 agent | ≥3 agents | ≥5 classes | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MIC50/90 | n (%) | MIC50/90 | n (%) | MIC50/90 | n (%) | MIC50/90 | n (%) | MIC50/90 | n (%) | MIC50/90 | n (%) | MIC50/90 | n (%) | MIC50/90 | n (%) | MIC50/90 | n (%) | MIC50/90 | n (%) | MIC50/90 | n (%) | n (%) | n (%) | n (%) | ||
| Hato (B) | 1 (0.8) | – | 1 (100) | – | 1 (100) | – | 1 (100) | – | 0 | – | 0 | – | 0 | – | 0 | – | 0 | – | 0 | – | 0 | – | 0 | 1 (100) | 1 (100) | 0 |
| Vellore (B) | 1 (0.8) | – | 0 | – | 1 (100) | – | 0 | – | 0 | – | 0 | – | 0 | – | 0 | – | 0 | – | 0 | – | 0 | – | 0 | 1 (100) | 0 | 0 |
| Montevideo (C1) | 75 (61.0) | 128/128 | 75 (100) | 4/32 | 35 (46.7) | 32/128 | 37 (49.3) | 4/16 | 24 (32) | 16/32 | 12 (16) | 1/1 | 3 (4.0) | 4/16 | 9 (12.0) | 4/8 | 2 (2.7) | 0.5/1 | 8 (10.7) | 2/2 | 2 (2.7) | 8/8 | 3 (4.0) | 75 (100) | 37 (49.3) | 4 (5.3) |
| Virchow (C1) | 3 (2.4) | 128/128 | 3 (100) | 16/32 | 3 (100) | 64/64 | 2 (66.7) | 8/8 | 0 | 64/64 | 2 (66.7) | 1/1 | 0 | 16/32 | 1 (33.3) | 8/8 | 0 | 0.25/0.25 | 0 | 2/2 | 0 | 8/8 | 0 | 3 (100) | 2 (66.7) | 0 |
| Infantis (C1) | 1 (0.8) | – | 1 (100) | – | 1 (100) | – | 1 (100) | – | 1 (100) | – | 1 (100) | – | 1 (100) | – | 0 | – | 0 | – | 0 | – | 1 (100) | – | 0 | 1 (100) | 1 (100) | 1 (100) |
| Edinburg (C1) | 1 (0.8) | – | 1 (100) | – | 0 | – | 0 | – | 0 | – | 0 | – | 0 | – | 1 (100) | – | 0 | – | 0 | – | 0 | – | 0 | 1 (100) | 0 | 0 |
| Emek (C2-C3) | 9 (7.3) | 128/128 | 9 (100) | 4/16 | 3 (33.3) | 8/32 | 1 (11.1) | 1/4 | 0 | 16/32 | 3 (33.3) | 0.5/1 | 0 | 4/16 | 0 | 2/4 | 0 | 0.5/0.5 | 0 | 2/2 | 0 | 4/8 | 0 | 9 (100) | 3 (33.3) | 0 |
| Macclesfield (D2) | 4 (3.3) | 64/128 | 4 (100) | 2/16 | 1 (25) | 8/128 | 1 (25) | 1/16 | 1 (6.3) | 16/64 | 1 (25) | 0.5/1 | 0 | 4/32 | 0 | 2/8 | 0 | 0.5/4 | 1 (25) | 2/2 | 0 | 2/8 | 0 | 4 (100) | 1 (25) | 0 |
| Senftenberg (E4) | 21 (17.1) | 128/128 | 21 (100) | 4/32 | 10 (47.6) | 32/128 | 4 (19) | 1/4 | 0 | 16/16 | 2 (9.5) | 0.5/1 | 0 | 4/16 | 2 (9.5) | 2/4 | 0 | 0.5/0.5 | 0 | 2/2 | 0 | 4/8 | 0 | 21 (100) | 2 (9.5) | 0 |
| spp. (C2-C3, B, D1) | 7 (5.7) | – | 6 (71.4) | – | 7 (100) | – | 4 (57.1) | – | 2 (28.6) | – | 1 (14.3) | – | 1 (14.3) | – | 4 (57.1) | – | 1 (14.3) | – | 0 | – | 1 (14.3) | – | 0 | 7 (100) | 4 (57.1) | 2 (28.6) |
| Total | 123 | 128/128 | 120 (97.6) | 8/32 | 62 (50.4) | 8/32 | 51 (41.5) | 1/16 | 28 (22.8) | 16/32 | 22 (17.9) | 1/1 | 5 (4.1) | 4/32 | 17 (13.8) | 4/8 | 3 (2.4) | 0.5/0.5 | 9 (7.3) | 2/2 | 4 (3.3) | 8/8 | 3 (2.4) | 123 (100) | 53 (43.1) | 7 (5.7) |
a-, not analyzed; the unit of MIC50/90 was μg/mL