Table 1.
Individual animal and herd seroprevalence for Mycobacterium avium subsp. paratuberculosis (MAP), Neospora caninum (NC), Bovine leukemia virus (BLV), Bovine viral diarrhea virus genotype 1 (BVDv1), and Bovine viral diarrhea virus genotype 2 (BVDv2) among dairy cattle and herds in Alberta
| Pathogen | Animal type | Individual (seropositive) % (95% CI) | Herda,b (≥ 1 seropositive) % (95% CI) | Herda,b (≥ 2 seropositive) % (95% CI) |
|---|---|---|---|---|
| MAP | All adult cows (n = 2819 animals in 77 herds) | 9.1 (6.3–13.0) | 70.2 (53.7–86.6) | 58.8 (42.2–75.4) |
| — 2nd and greater lactation (n = 2311 animals in 77 herds) | 10.9 (7.4–15.7) | — | — | |
| — 1st lactation (n = 508 animals in 73 herds) | 0.4 (0.1–1.5) | — | — | |
| NC | All adult cows (n = 2816 animals in 77 herds) | 18.5 (12.0–27.5) | 98.7 (97.5–99.9) | 88.5 (77.7–99.2) |
| — 2nd and greater lactation (n = 2308 animals in 77 herds) | 19.0 (11.9–29.2) | — | — | |
| — 1st lactation (n = 508 animals in 73 herds) | 15.9 (11.3–21.9) | — | — | |
| BLV | All adult cows (n = 2814 animals in 77 herds) | 26.9 (22.1–32.2) | 86.7 (78.5–92.1) | 77.7 (67.2–88.2) |
| — 2nd and greater lactation (n = 2306 animals in 77 herds) | 28.3 (23.1–34.1) | — | — | |
| — 1st lactation (n = 508 animals in 73 herds) | 19.8 (12.6–29.6) | — | — | |
| BVDv1c | Unvaccinated heifers (n = 179 animals in 36 herds) | 28.4 (14.6–48.0) | 53.4 (30.4–75.0) | 32.2 (9.9–54.4) |
| BVDv2c | Unvaccinated heifers (n = 179 animals in 36 herds) | 8.9 (3.7–20.1) | 19.7 (7.4–43.0) | 9.2 (1.3–17.2) |
aHerd positivity for MAP, NC, and BLV is based on the entire sample including cows of all lactations
bHerd positivity for BVDv1 and BVDv2 is based on the 5 younger animals tested in each herd
cBased on a titer of ≥ 1:2