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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.