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Samples selected from red and black spots.
| Category | PRV status | Grading | Sampling time (weeks after transfer to sea) |
|---|---|---|---|
| Black spot | Positive (n = 6) | Grade 1-3 black spots | 52 |
| Negative (n = 6) | Grade 1-2 black spots | 4 | |
| Red spot | Positive (n = 5) | Grade 1-3 red spots | 52 |
| Negative (n = 6) | Grade 1-3 red spots | 4 | |
| No spot | Positive (n = 6) | No macroscopic lesion | 52 |
| Negative (n = 4) | No macroscopic lesion | 4 |
