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Table 1 Positive results obtained by analysis of faeces and sera from 176 pigs in 24 herds collected during two previous studies, A and B, and analysed by nested PCR and by two serological methods, ELISA and IFAT.

From: Evaluation of a blocking ELISA for the detection of antibodies against Lawsonia intracellularis in pig sera

  PCR ELISA (PI > 30)* ELISA (PI > 35)* IFAT
Study A. Pigs from poor performance herds     
No of positive animals (%) 29 (44) 37 (56) 34 (52) 47 (71)
No of positive herds (%) 8 (89) 9 (100) 9 (100) 9 (100)
Study A. Pigs from good performance herds     
No of positive animals (%) 0 0 0 3 (25)
No of positive herds (%) 0 0 0 3 (75)
Study B. Pigs with diarrhoea and poor performance     
No of positive animals (%) 24 (22) 46 (42) 25 (23) 20 (18)
No of positive herds (%) 5 (45) 9 (82) 5 (45) 4 (36)
  1. *In the blocking ELISA, two cut-off values (PI 30 and PI 35, respectively) were evaluated.