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The number of E. faecium isolates examined from different origins, the occurrence of copper resistance, and the approximate use of copper sulfate in each group
| Origin | No. of isolates | No. of copper-resistant isolates (%) | CuSO4 (ppm) in feed |
|---|---|---|---|
| Pig | 59 | 45 (76) | 165/25a |
| Broiler | 29 | 10 (34) | 20 |
| Calve | 32 | 5 (16) | 2 |
| Sheep | 22 | 0 (0) | 0 |
| Human | 29 | 3 (10) | 0 |
That is, 165 ppm for weaners and 25 ppm for slaughter pigs.
