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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.