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Table 4 Apparent and true L. intracellularis seropositivity in pigs from commercial herds by stock class and diarrhea status of the herd

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:     
 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:     
 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)
  1. Number of pigs seropositive to L. intracellularis per 100 pigs tested.
  2. a-b,b-b,c-c,d-dTrue prevalence estimates with the same superscript significantly different at the alpha level of 0.05.