Table 1. Characteristics of study subjects.
| Number of subjects | All (n = 44) | NN group (n = 11) | PN group (n = 12) | NP group (n = 14) | PP group (n = 7) | |
|---|---|---|---|---|---|---|
| Heifers, n (%) | 44 (100) | 11 (100) | 12 (100) | 14 (100) | 7 (100) | |
| Median age (Years) | 6 (4 to 9) | 4 (4 to 7) | 6 (4 to 9) | 6.5 (4 to 8) | 6 (5 to 8) | |
| Serum ELISA | Positive, n (%) | 21 (47.7) | 0 (0) | 0 (0) | 14 (100) | 7 (100) |
| Negative, n (%) | 23 (52.3) | 11 (100) | 12 (100) | 0 (0) | 0 | |
| Fecal PCR | Positive, n (%) | 19 (43.2) | 0 (0) | 12 (100) | 0 (0) | 7 (100) |
| Negative, n (%) | 25 (56.8) | 11 (100) | 0 (0) | 14 (100) | 0 (0) | |