Table 1 Antibodies to L. intracellularis in commercial pigs by province and region
From: Seroprevalence of Lawsonia intracellularis antibodies in intensive pig farms in China
Province | Number of pigs# | Prevalence (95% CI)†| ||
|---|---|---|---|---|
| Â | Positive | Tested | Apparent | True |
Northern China: | Â | Â | Â | Â |
 Beijing | 88 | 145 | 61 (41 to 80) | 83 (68 to 98) |
 Hebei | 87 | 146 | 60 (40 to 79) | 81 (65 to 96) |
 Tianjin | 75 | 146 | 51 (32 to 71) | 68 (50 to 87) |
 Sub-total | 250 | 437 | 57 (46 to 68) | 77 (68 to 87)a,b |
Central China: | Â | Â | Â | Â |
 Henan | 118 | 187 | 63 (46 to 80) | 86 (74 to 98) |
 Hubei | 137 | 188 | 73 (58 to 88) | 100 (100 to 100) |
 Sub-total | 255 | 375 | 68 (57 to 79) | 94 (88 to 100)a,c |
Southern China | Â | Â | Â | Â |
 Guangdong | 58 | 124 | 47 (25 to 68) | 61 (40 to 82) |
 Guanxi | 43 | 124 | 35 (14 to 55) | 43 (22 to 64) |
 Sub-total | 101 | 248 | 41 (26 to 55) | 52 (37 to 67)b,c |
 Total | 602 | 1060 | 57 (50 to 64) | 77 (70 to 83) |