Gastro-intestinal lesions are not relatable to diarrhoea or specific pathogens in post-weaning diarrhoea (PWD) in pigs

Table 2 Histopathological manifestations in the jejunum, ileum and colon and the various pathogens in pigs without post-weaning diarrhoea (PWD)

Histopathology Pathogen (n)	Jejunum (n)									Ileum (n)
Histopathology Pathogen (n)	Crypt abscesses (abundant/few)	Dilated crypts	Eosinophilic granulocyte infiltration	Haemorrhage	Hyperleukocytosis	Hyperplastic crypts	Hypersecretion	Necrosis	Neutrophilic granulocyte infiltration	Crypt abscesses (abundant/few)	Dilated crypts	Eosinophilic granulocyte infiltration	Haemorrhage	Hyperleukocytosis
Escherichia coli (E. coli) – haemolytic non-enterotoxigenic E. coli (24*^a)	0/3	0	9	0	1	2	0	0	4	0/11	8	17	0	2
Enterotoxigenic E. coli, < 50% haemolytic colonies (9*^b)	0/1	0	6	0	0	0	0	0	1	0/4	4	7	0	0
Enterotoxigenic E. coli, > 50% haemolytic colonies (11*)	0/1	0	4	0	2	0	0	0	3	0/5	4	8	0	2
Enterotoxigenic E. coli, all (20*^c)	0/2	0	10	0	2	0	0	0	4	0/9	8	15	0	2
Porcine Circovirus type 2 (5)	0/0	0	0	0	0	0	0	0	1	0/2	2	3	0	1
Rotavirus A (69^d)	0/5	4	35	1	4	3	4	0	14	1/33	27	53	0	12
Salmonella spp (6)	0/1	1	5	1	2	1	1	0	0	0/3	3	5	0	0

Histopathology Pathogen (n)	Ileum (n)				Colon (n)
Histopathology Pathogen (n)	Hyperplastic crypts	Hypersecretion	Necrosis	Neutrophilic granulocyte infiltration	Crypt abscesses (abundant/few)	Dilated crypts	Eosinophilic granulocyte infiltration	Haemorrhage	Hyperleukocytosis	Hyperplastic crypts	Hypersecretion	Necrosis	Neutrophilic granulocyte infiltration
Escherichia coli (E. coli) – haemolytic non-enterotoxigenic E. coli (24*^a)	10	8	0	1	1/14	10	1	1	2	19	10	3	4
Enterotoxigenic E. coli, < 50% haemolytic colonies (9*^b)	5	4	1	1	0/4	4	0	0	0	6	4	0	2
Enterotoxigenic E. coli, > 50% haemolytic colonies (11*)	6	4	0	1	0/5	3	0	1	0	8	3	0	2
Enterotoxigenic E. coli, all (20*^c)	11	8	1	2	0/9	7	0	1	0	14	7	0	4
Porcine Circovirus type 2 (5)	2	2	0	0	1/2	3	0	0	1	4	3	0	0
Rotavirus A (69^d)	43	27	3	10	5/33	32	0	2	1	54	32	1	10
Salmonella spp (6)	4	3	0	1	1/3	3	0	0	0	5	3	0	1

For each pathogen, the total number of positive pigs is listed in the parenthesis in the first column. Moreover, the numbers of pigs with specific lesions within the different intestinal regions are presented for each of the pathogens
n: Number of positive pigs
*Seven animals were excluded due to unknown ETEC status
^aTwo of the 24 pigs had missing values in several of the variables due to autolysis
^bTwo of the nine pigs had missing values in several of the variables due to autolysis
^cTwo of the 20 pigs had missing values in one or more of the variables due to autolysis
^dFour of the 69 pigs had missing values in one or more variables due to autolysis

ISSN: 1751-0147