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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

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)