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Table 2 Association between virulence genes, serogroups, HUS, and hospitalization among 333 cases of STEC infection, Norway 1992–2012

From: Shiga toxin-producing escherichia coli infections in Norway, 1992–2012: characterization of isolates and identification of risk factors for haemolytic uremic syndrome

Virulence genes

No. (%) of patients

  

All (333)

O157 (112, 33.6 %)

Non-O157 (221, 66.4 %)

p-valuea

HUS (25, 7.5 %)

Non-HUS (308, 92.5 %)

p-value

Hospitalizedb(141, 42.3 %)

p-value

stx1

 

215 (64.7 %)

66

150

 

1c

214

<0.005

83

0.01

 

stx1a

189

66

123

 

1

188

<0.005

75

 
 

stx1c

23

0

23

<0.005

0

23

 

7

 
 

stx1d

3

0

3

 

0

3

 

1

 

stx2

 

207d (62.2 %)

109

98

<0.005

25e

182

<0.005

106

<0.005

 

stx2a

85

32

53

 

24

61

<0.005

51

<0.005

 

stx2b

32

0

32

<0.005

0

32

 

6

0.05

 

stx2c

100

92

8

<0.005

2

98

0.01

57

<0.005

 

stx2d

9

1

8

 

0

9

 

4

 
 

stx2g

2

0

2

 

0

2

 

NDf

 

eae

 

246 (73.9 %)

112

134

<0.005

25

220

<0.005

117

0.02

ehxA

 

283 (85.0 %)

109

174

<0.005

25

258

 

131

<0.005

  1. aOnly p-values ≤ 0.05 were shown
  2. bNo information on hospitalization was available for 37 patients. These patients carried STEC with the following stx genes; stx1a (n = 17), stx1c (n = 1), stx1d (n = 2), stx2a (n = 6), stx2b (n = 9), stx2c (n = 10), and stx2g (n = 2) (n = number of patients) (some patients carried STEC with more than one stx subtype)
  3. cFrom one HUS patient two different non-O157 STEC isolates were included. One with stx1a and another with stx1a + stx2a and this patient was included both in the stx1 and stx1a groups as well as in the stx2 and stx2a groups
  4. dIncluding 21 patients with STEC harbouring more than one stx2 subtype; stx2a + stx2c (n = 19), stx2a + stx2d (n = 1), and stx2c + stx2d (n = 1)
  5. eOne HUS patient carried a STEC with both stx2a + stx2c and this patient was included within the stx2a group as well as in the stx2c group
  6. fND: not determined
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BMC Infectious Diseases

ISSN: 1471-2334

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