Table 6.
Composition of the risk-based surveillance scenarios
| Criteria | Points | Testing interval by points score | No. of herds (%) | bTB (RHT)* |
|---|---|---|---|---|
| Improved | ||||
| Slaughtering <25% of stock | +1 | 0 points = no testing | 2687 (22·9) | 26 (1) |
| 1 point = 4 year testing | 8052 (68·6) | 52(26) | ||
| Receiving ‘high risk’ animals in >3 years and slaughtering <50% of stock | +1 | 2 points = 2 year testing | 991 (8·4) | 20 (9) |
| Similar | ||||
| Slaughtering <25% of stock and/or receiving ‘high risk’animals in >3 years and slaughtering <40% of stock | 1 | 0 points = no testing | 2788 (23·8) | 29 (1) |
| 1 point = 4 year testing | 8942 (76·2) | 69 (35) | ||
| Lower detection 1 | ||||
| Slaughtering <12·5% of stock and/or receiving ‘high risk’ animals in >3 years and slaughtering <25% of stock | 1 | 0 points = no testing | 4658 (39·7) | 55 (15) |
| 1 point = 4 year testing | 7072 (60·3) | 43 (21) | ||
| Lower detection 2 | ||||
| Slaughtering >25% of stock | −1 | −1 or 0 points = no testing | 4971 (42·4) | 19 (3) |
| Slaughtering <5% of stock | +1 | 1 point = 4 year testing | 5340 (45·5) | 58 (22) |
| Receiving ‘high risk’ animals in >3 years | +1 | 2 points = 2 year testing | 1288 (11·0) | 20 (11) |
| Having >100 animals | +1 | 3 points = annual testing | 131 (1·1) | 1 (0) |
bTB, Bovine tuberculosis; RHT, routine herd testing.
*
bTB is the number of confirmed breakdowns between 2003 and 2008 that fell into that category. RHT is the breakdowns that were detected by RHT.