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Table 2 Seropositivity to L. intracellularis in commercial pigs by stock class

From: Seroprevalence of Lawsonia intracellularis antibodies in intensive pig farms in China

Age class

Number of pigs#

Prevalence (95% CI)†

 

Positive

Tested

Apparent

True

Pre-weaning

47

147

32 (14 to 50)

38 (19 to 57)a

Weaners

58

221

26 (12 to 40)

29 (15 to 44)b,c,d

Fattening

166

279

60 (46 to 73)

81 (69 to 92)a,b,e,f

Sows

186

255

73 (60 to 86)

100 (100 to 100)a,c,e

Boars

145

158

92 (81 to 100)

100 (100 to 100)a,d,f

Total

602

1060

57 (50 to 64)

77 (66 to 87)

  1. #Number of pigs tested, number of pigs positive to the L. intracellularis ELISA test and apparent and true prevalence of L. intracellularis seropositivity, by stock class.
  2. †Number of pigs seropositive to L. intracellularis per 100 pigs tested.
  3. a-a,b-b,c-c,d-d,e-e,f-fTrue prevalence estimates with the same superscript significantly different at the alpha level of 0.05.