From: Seroprevalence of Lawsonia intracellularis antibodies in intensive pig farms in China
Breed | Number of pigs | Prevalence (95% CI)†| ||
---|---|---|---|---|
 | Positive | Tested | Apparent | True |
Diarrhea present: | Â | Â | Â | Â |
 Pre-weaning | 2 | 94 | 2 (0 to 9) | 0 (0 to 0)a |
 Weaners | 9 | 129 | 7 (0 to 18) | 0 (0 to 21)b |
 Fattening | 124 | 159 | 78 (62 to 94) | 100 (100 to 100)c |
 Sows | 130 | 157 | 83 (69 to 97) | 100 (100 to 100)d |
 Boars | 116 | 120 | 97 (89 to 100) | 100 (100 to 100) |
 Sub-total | 381 | 659 | 58 (49 to 67) | 78 (71 to 86) |
Diarrhea absent: | Â | Â | Â | Â |
 Pre-weaning | 45 | 53 | 85 (61 to 100) | 100 (100 to 100)a |
 Weaners | 49 | 92 | 53 (28 to 78) | 71 (48 to 93)b |
 Fattening | 42 | 120 | 35 (14 to 56) | 43 (22 to 65)c |
 Sows | 56 | 98 | 57 (33 to 81) | 78 (57 to 98)d |
 Boars | 29 | 38 | 76 (42 to 100) | 100 (100 to 100) |
 Sub-total | 221 | 401 | 55 (43 to 67) | 74 (64 to 84) |
Total | 602 | 1060 | 57 (50 to 64) | 77 (66 to 87) |