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Table 1 Documented virotypes and serotypes of E. coli causing ETEC and STEC at the case herds 1 to 5 prior to performing trials

From: Zinc oxide enriched peat influence Escherichia coli infection related diarrhea, growth rates, serum and tissue zinc levels in Norwegian piglets around weaning: five case herd trials

Farm Piglet genotype Pathotype Virotype O serogroups
1 LYLL ETEC F4  
2 LYHH ETEC   O149
3 LYLL ETEC   O138
4 LYLD ETEC LT:STb  
5 LYHH STEC Stx2e:F18 O139
  1. The pathotypes, virotypes and O serogroups verified at the case herds 1 to 5 prior to recruitment for the trials are listed. Strains of E.coli isolated from fecal samples of piglets after post mortem examination were either forwarded by the veterinarian in charge to the Norwegian Veterinary Institute for serotype determination (agglutination in microtiterplates with boiled antigen and single O-antisera) or to the Norwegian School of Veterinary Science in Oslo for virulence pattern determination (PCR analysis). The pathotype Enterotoxigenic E. coli (ETEC) was found at Farms 1 to 4 while Shiga-toxigenic E. coli (STEC) was found at Farm 5. Virotypes at Farms 1, 4 and 5 were F4, LT:STb and Stx2e:F18, respectively. The O serogroups O149, O138 and O139 were identified at Farms 2, 3 and 5, respectively. Genetic combinations of piglets included Landrace x Yorkshire (LY) x Landrace x Landrace (LL) (LYLL) at Farm 1. At Farm 2, LY x Hampshire/Hampshire (HH) (LYHH) were used. At Farm 3, LYLL piglets were utilized. LY x Landrace/Duroc (LYLD) and LYHH were used at Farms 4 to 5, respectively