Table 5.
Apparent and true (estimated) animal prevalence of Mycobacterium avium subspecies paratuberculosis infection stratified by age
| Age | Apparent seroprevalence % (95% CI) | True prevalence1% (95% CI) | Total number of animals |
|---|---|---|---|
| <2 | 0.59 (0.40, 0.86) | 1.41 (1.24, 1.58) | 4764 |
| 2 | 0.64 (0.39, 1.02) | 1.59 (1.36, 1.82) | 2833 |
| 3 | 0.56 (0.30, 1.00) | 1.30 (1.06, 1.55) | 2151 |
| 4 | 1.04 (0.64, 1.66) | 3.04 (2.68, 3.41) | 1819 |
| 5+ | 1.42 (1.18, 1.69) | 4.42 (4.23, 4.62) | 8755 |
| >= 2 | 1.11 (0.95, 1.29) | 3.30 (3.17, 3.43) | 15,558 |
| Total | 0.99 (0.86, 1.14) | 2.86 (2.76, 2.97) | 20,322 |
1 Based on a test sensitivity of 27.8% and specificity of 99.8%.