| |
MLSTA
| | | |
|---|
|
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
|
- AMLST, multilocus sequence typing.
- B ST, sequence type.
- C E. coli isolates in phylogenetic groups B2 and D are more likely to be associated with disease than phylogenetic groups A and B1.
- D20 eggs were inoculated for each isolate. There were no deaths in the control groups (PBS-inoculated and uninoculated eggs).
- 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.
