TABLE 1.
Occurrence of Salmonella in pigs at different stages of production, in truck swabs, and in lagoon water samples on four swine farms
| Samples | No. from each farm | No. (%) positive for:
|
||||
|---|---|---|---|---|---|---|
| Farm 1 | Farm 2 | Farm 3 | Farm 4 | Total | ||
| Fecal | ||||||
| Nursery | 60 | 4 (6.4) | 3 (5.0) | 13 (21.7) | 5 (8.3) | 25 (10.4) |
| Finisher 1 | 60 | 9 (15.0) | 3 (4.8) | 16 (26.7) | 28 (11.6) | |
| Finisher 2 | 60 | 7 (11.7) | 21 (33.9) | NDa | 5 (8.3) | 33 (18.3) |
| Slaughter | ||||||
| Cecal contents | 60 | 38 (63.3) | 29 (48.3) | ND | 15 (25.0) | 82 (45.5) |
| Mesenteric lymph nodes | 60 | 34 (56.7) | 39 (65.0) | ND | 30 (50.0) | 103 (57.2) |
| Environment | ||||||
| Nursery truck swabs | 1 | 1 | 1 | 1 | 1 | 4 |
| Finisher pen swabs | 10 | 1 (10.0) | ND | 1 (10.0) | 2 (20.0) | 4 (13) |
| Lagoon inlet | 1 | ND | 1 | 1 | ||
| Lagoon outlet | 1 | 1 | ND | 1 | 2 | |
| Pooled lagoon | 1 | 1 | ND | 1 | 1 | 3 |
| Barn flush | 1 | 1 | ND | 1 | 1 | 3 |
| Preload truck swabs | 3 | 3 | 3 | ND | 2 | 8 |
| Postload truck swabs | 3 | 3 | 3 | ND | 2 | 8 |
| Holding pen swabs | 3 | 3 | 3 | ND | 0 | 6 |
a
ND, not determined.