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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)
  Positive Tested Apparent True
Northern China:     
 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:     
 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     
 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)
  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 province and region.
  2. Number of pigs seropositive to L. intracellularis per 100 pigs tested.
  3. a-a,b-b,c-cTrue prevalence estimates with the same superscript significantly different at the alpha level of 0.05.