Table 2.
Distribution of Salmonella spp. isolated from 58 commercial farms of 5 integrated broiler operations.
| Operation (No. of farms) | Serovar | No. (%) of Salmonella-positive farms |
||||
|---|---|---|---|---|---|---|
| Environments |
Dead chickens |
|||||
| Prior to placement |
At the time of depletion |
Within 1 week old | At 4–5 weeks old | |||
| Dust | Dust | Feces | ||||
| A (n = 12) | S. Infantis | 0 (0.0) | 2 (16.7) | 2 (16.7) | 0 (0.0) | 2 (16.7) |
| S. Thompson | 0 (0.0) | 0 (0.0) | 0 (0.0) | 1 (8.3) | 0 (0.0) | |
| Total | 0 (0.0) | 2 (16.7) | 2 (16.7) | 1 (8.3) | 2 (16.7) | |
| B (n = 12) | S. Agona | 0 (0.0) | 0 (0.0) | 0 (0.0) | 1 (8.3) | 0 (0.0) |
| S. Infantis | 1 (8.3) | 3 (25.0) | 5 (41.7) | 1 (8.3) | 2 (16.7) | |
| S. Montevideo | 0 (0.0) | 0 (0.0) | 0 (0.0) | 1 (8.3) | 0 (0.0) | |
| S. Senftenberg | 0 (0.0) | 0 (0.0) | 1 (8.3) | 0 (0.0) | 0 (0.0) | |
| Total | 1 (8.3) | 3 (25.0) | 6 (50.0) | 3 (25.0) | 2 (16.7) | |
| C (n = 12) | S. Bareilly | 1 (8.3) | 0 (0.0) | 0 (0.0) | 1 (8.3) | 1 (8.3) |
| S. Enteritidis | 0 (0.0) | 0 (0.0) | 2 (16.7) | 3 (25.0) | 0 (0.0) | |
| S. Infantis | 1 (8.3) | 2 (16.7) | 6 (50.0) | 1 (8.3) | 1 (8.3) | |
| S. Senftenberg | 1 (8.3) | 2 (16.7) | 0 (0.0) | 2 (16.7) | 0 (0.0) | |
| S. Thompson | 0 (0.0) | 0 (0.0) | 0 (0.0) | 2 (16.7) | 1 (8.3) | |
| Total | 3 (25.0) | 4 (33.3) | 8 (66.7) | 7 (58.3) | 3 (25.0) | |
| D (n = 10) | S. Enteritidis | 0 (0.0) | 0 (0.0) | 1 (10.0) | 3 (30.0) | 1 (10.0) |
| S. Infantis | 0 (0.0) | 4 (40.0) | 4 (40.0) | 0 (0.0) | 3 (30.0) | |
| Total | 0 (0.0)B | 4 (40.0)A, B | 5 (50.0)A | 3 (30.0) | 4 (40.0) | |
| E (n = 12) | S. Agona | 0 (0.0) | 0 (0.0) | 0 (0.0) | 1 (8.3) | 0 (0.0) |
| S. Enteritidis | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 1 (8.3) | |
| S. Infantis | 1 (8.3)B | 5 (41.7)A, B | 7 (58.3)A | 0 (0.0)D | 4 (33.3)C | |
| S. Montevideo | 1 (8.3) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | |
| S. Senftenberg | 0 (0.0) | 0 (0.0) | 0 (0.0) | 1 (8.3) | 2 (16.7) | |
| Total | 2 (16.7) | 5 (41.7) | 7 (58.3) | 2 (16.7) | 5 (41.7) | |
| Total (n = 58) | S. Agona | 0 (0.0) | 0 (0.0) | 0 (0.0) | 2 (3.4) | 0 (0.0) |
| S. Bareilly | 1 (1.7) | 0 (0.0) | 0 (0.0) | 1 (1.7) | 1 (1.7) | |
| S. Enteritidis | 0 (0.0) | 0 (0.0) | 3 (5.2) | 6 (10.3) | 2 (3.4) | |
| S. Infantis | 3 (5.2)B | 16 (27.6)A | 24 (41.4)A | 2 (3.4)D | 12 (20.7)C | |
| S. Montevideo | 1 (1.7) | 0 (0.0) | 0 (0.0) | 1 (1.7) | 0 (0.0) | |
| S. Senftenberg | 1 (1.7) | 2 (3.4) | 1 (1.7) | 3 (5.2) | 2 (3.4) | |
| S. Thompson | 0 (0.0) | 0 (0.0) | 0 (0.0) | 3 (5.2) | 1 (1.7) | |
| Total | 6 (10.3)B | 18 (31.0)A | 28 (48.3)A | 16 (27.6) | 16 (27.6) | |
Values with different subscript letters (A, B) represent significant differences between environments by operations, while subscript letters (C, D) represent significant differences between dead chickens (P < 0.05).