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Number of dairy herds (%) in Norway, positive and negative for BRSV on two sampling occasions
| 2nd sampling | |||
|---|---|---|---|
| 1st sampling | Negative | Positive | Total |
| Negative | 54 (67) | 27 (33) | 81 (69) |
| Positive | 15 (42) | 21 (58) | 36 (31) |
| Total | 69 (59) | 48 (41) | 117 (100) |
Serum of an average of five animals in each herd was tested for antibodies against BRSV at each occasion. A herd was classified as positive if at least one sampled animal was antibody positive
BRSV, bovine respiratory syncytial virus
