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Table 4 Experimental virulence of representative isolates in BALB/c mice

From: Characterization and virulence clustering analysis of extraintestinal pathogenic Escherichia coli isolated from swine in China

Clusters

Strains

Mortality

Phylogenetic

groups

Virulence

  

4 × 107

4 × 106

Cluster I

PxECZ01C

0/5

0/5

D

None virulence

Cluster II

PxECZF4d

0/5

0/5

D

None virulence

Cluster II

CZN3C

2/5

0/5

D

Less virulence

Cluster III

PxECZF4C2

1/5

0/5

D

Less virulence

Cluster III

SXE-8

3/5

0/5

D

Less virulence

Cluster III

PxECZB1C

2/5

0/5

D

Less virulence

Cluster III

SXE-1

2/5

0/5

D

Less virulence

Cluster III

PxE11-1

2/5

0/5

D

Less virulence

Cluster III

DCE-7

1/5

0/5

D

Less virulence

Cluster III

SXE-16

3/5

0/5

D

Less virulence

Cluster III

SXE-20

4/5

0/5

D

Less virulence

Cluster III

PxECZPF1C

3/5

0/5

D

Less virulence

Cluster III

SXE-13

1/5

0/5

D

Less virulence

Cluster III

SXE-14

5/5

1/5

D

Virulence

Cluster IV

DCE-9

3/5

0/5

B2

Less virulence

Cluster IV

DCE-6

4/5

1/5

B2

Virulence

Cluster IV

DCE-2

3/5

0/5

B2

Less virulence

Cluster IV

DCE-5

4/5

3/5

B2

Virulence

Cluster IV

DCE-1

4/5

2/5

B2

Virulence

Cluster IV

DCE-8

4/5

2/5

B2

Virulence

Cluster IV

JX131101

5/5

5/5

B2

Virulence

 

PBS

No mortality

  
  1. All these strains were able to kill BALB/c mice in doses of 108 cfu, including PxECZ01C and PxECZF4d