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Table 3 Interpretative criteria used for the diagnosis of E.coli neonatal and post-weaning diarrhoea (modified from Fairbrother and Gyles, 2012) [1]

From: Swine enteric colibacillosis: diagnosis, therapy and antimicrobial resistance

Criteria

ETEC

ETEC

EPEC

F4

F18

F5

F6

F41

Haemolytic colonies

Nearly all

None

None

Genotypic analysis

Fimbriae and toxins

Eae (intimin)

Serogroups (most prevalent)

O8, O138, O139, O141, O147, O149, O157

O8, O9, O20, O64, O101

O45, O103

Slide agglutination (F adhesin serotyping)

All

Not reliable

Not reliable

Not reliable

Histology

Bacterial layers are observed in patches on the apical surface of villous epithelial cells in the ileum and to a lesser extent in the jejunum

Multifocal “attaching and effacing” (AE) lesions involving the small intestine (duodenum, ileum, cecum)