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Table 1 The findings in intestinal specimens from growing pigs with diarrhoea (case), clinically healthy control pigs from the same poor performance herds (casecontrol), and from healthy pigs originating from good performance herds (control), examined by immunohistochemistry (IHC), necropsy, and PCR.

From: The occurrence of Chlamydiaspp. in pigs with and without clinical disease

   Case Casecontrol Control
   (n = 18) (n = 18) (n = 12)
IHC - 1 (7%) 9 (53%) 2 (17%)
  + 5 (33%) 3 (18%) 7 (58%)
  ++ 7 (47%) 4 (24%) 3 (25%)
  +++ 2 (13%) 1 (6%) 0
  missing 3 1 -
Necropsy Villi atrophy 6 (33%) 10 (56%) 0
  Villi necrosis 5 (28%) 1 (6%) 1 (8%)
PCR positive 18 (100%) 18 (100%) 10 (83%)
  inhibited 0 0 2 (17%)
  1. The percentage given within brackets is calculated on the actual number of analyses performed in each group, i.e. the "missing samples" are excluded