Table 1 Positive results obtained by analysis of faeces and sera from 176 pigs in 24 herds collected during two previous studies, A and B, and analysed by nested PCR and by two serological methods, ELISA and IFAT.
| Â | PCR | ELISA (PI > 30)* | ELISA (PI > 35)* | IFAT |
|---|---|---|---|---|
Study A. Pigs from poor performance herds | Â | Â | Â | Â |
No of positive animals (%) | 29 (44) | 37 (56) | 34 (52) | 47 (71) |
No of positive herds (%) | 8 (89) | 9 (100) | 9 (100) | 9 (100) |
Study A. Pigs from good performance herds | Â | Â | Â | Â |
No of positive animals (%) | 0 | 0 | 0 | 3 (25) |
No of positive herds (%) | 0 | 0 | 0 | 3 (75) |
Study B. Pigs with diarrhoea and poor performance | Â | Â | Â | Â |
No of positive animals (%) | 24 (22) | 46 (42) | 25 (23) | 20 (18) |
No of positive herds (%) | 5 (45) | 9 (82) | 5 (45) | 4 (36) |