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Table 1 Characteristics of tester and driver strains

From: Common and specific genomic sequences of avian and human extraintestinal pathogenic Escherichia coli as determined by genomic subtractive hybridization

Strain STB ST complex Phylogenetic groupC % Embryo deathsD Pathogenicity groupE
APEC O1 95 95 B2 60 High
APEC 113 79 95 B2 15 Intermediate
UPEC 88 73 73 B2 45 NA
UPEC CFT073 73 73 B2 40 NA
  1. AMLST, multilocus sequence typing.
  2. B ST, sequence type.
  3. C E. coli isolates in phylogenetic groups B2 and D are more likely to be associated with disease than phylogenetic groups A and B1.
  4. D20 eggs were inoculated for each isolate. There were no deaths in the control groups (PBS-inoculated and uninoculated eggs).
  5. EPathogenicity group of the 2 APEC strains were determined according to a previously described scheme [32]. Highly pathogenic (high) isolates caused mortality or severe lesions (pericarditis, perihepatitis, and/or liver necrosis) in >50% of the chickens inoculated. Intermediate pathogens did not cause death and produced lesions in <50% of chickens inoculated. Weak pathogens (low) produced no mortality and occasional airsacculitis NA – not applicable, because pathogenicity of UPEC isolates for day-old chickens was not determined.