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Epidemiology

Shiga-Toxigenic Escherichia coli Detection in Stool Samples Screened for Viral Gastroenteritis in Alberta, Canada

Marc Roger Couturier, Bonita Lee, Nathan Zelyas, Linda Chui
Marc Roger Couturier
1Alberta Provincial Laboratory for Public Health, Edmonton, Alberta, Canada
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Bonita Lee
1Alberta Provincial Laboratory for Public Health, Edmonton, Alberta, Canada
2Department of Paediatrics, University of Alberta, Edmonton, Alberta, Canada
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Nathan Zelyas
1Alberta Provincial Laboratory for Public Health, Edmonton, Alberta, Canada
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Linda Chui
1Alberta Provincial Laboratory for Public Health, Edmonton, Alberta, Canada
3Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, Alberta, Canada
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  • For correspondence: l.chui@provlab.ab.ca
DOI: 10.1128/JCM.01693-10
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Tables

  • Table 1.

    Electronic microscopy, viral culture, real-time PCR, and E. coli culture results for 2006-2008 “viral” stool samples in Alberta and northern territories of Canada

    Yr (no. of samples)Median patient age (yr) (interquartile range) for all included samplesNo. of samples positive/total no. tested (% positive) for:Median patient age (yr) (interquartile range) for Stx-positive samples)Types of stx genes (n)No. culture positive on nonselective and/or selective solid medium/total no. Stx positive (%)
    Enteric virus, tested by EMaNorovirusVirus, tested by viral culturebEnteric bacteria, tested by enteric culturecStx, tested by real-time PCR
    2006 (960)11 (1.2–60)d46/855 (5.4)e45/86 (52.3)f6/61 (9.8)g6/189 (3.2)g10/960 (1.0)f6.5 (4.8–58)hstx1 (5), stx2 (1), stx1 and stx2 (4)0/10 (0)i
    2007 (712)7 (1.1–49)d43/666 (6.5)e18/52 (34.6)f1/47 (2.1)g6/140 (4.3)g16/712 (2.3)f2.5 (1.4–52)hstx1 (11), stx2 (2), stx1 and stx2 (3)6/16 (38)i
    2008 (1,053)19 (1.4–54)d35/1018 (3.4)e17/45 (37.8)f0/22 (0)g2/108 (1/9)g12/1053 (1.1)f10 (1.4–22)hstx1 (7), stx2 (1), stx1 and stx2 (4)9/12 (75)i
    Total (2,725)12.5 (1.2–55)124/2539 (4.9)80/183 (37.8)7/130 (5.4)14/437 (3.2)38/2725 (1.4)10 (1.8–50)stx1 (23), stx2 (4), stx1 and stx2 (11)15/38 (39.5)
    • ↵a Enteric viruses detected by electron microscopy (EM) in the different years: 2006, 5 adenovirus and 41 rotavirus; 2007, 3 adenovirus, 39 rotavirus, and 1 small round structured virus; 2008, 8 adenovirus, 25 rotavirus, and 2 small round structured virus.

    • ↵b Viruses isolated by culture in the different years: 2006, 1 adenovirus and 5 enterovirus; 2007, 1 enterovirus.

    • ↵c Bacteria isolated by enteric culture in the different years: 2006, 2 Campylobacter jejuni, 2 Clostridium perfringens, 1 Aeromonas caviae, and 1 Salmonella Poona; 2007, 3 Salmonella Typhimurium, 1 Salmonella Hadar, 1 Aeromonas caviae, and 1 Campylobacter jejuni; 2008, 1 Aeromonas caviae and 1 Plesiomonas shigelloides.

    • ↵d P < 0.05 by Kruskal-Wallis test.

    • ↵e P < 0.05 by chi-square test.

    • ↵f Not significant by chi-square test.

    • ↵g Not significant by Fisher exact test.

    • ↵h Not significant by Kruskal-Wallis test.

    • ↵i P < 0.05 by Fisher exact test.

  • Table 2.

    Shiga-toxigenic E. coli isolated from patient stool from Alberta and Northern Territories

    YrSerotypePatient agestx type(s)Stool appearance
    2007O26:H1183 yrstx1Liquid, brown
    Orough:H113 yrstx1Liquid, brown
    O11:H303 yrstx1Liquid, brown
    O157:H162 yrstx1/stx2Solid, brown
    O6:H16/O103:H2531 yrstx1Liquid, brown
    2008O145:HNM8 mostx1Liquid, tan
    O26:HNM13 yrstx1Liquid, brown
    O69:H1152 yrstx1Solid, brown
    O26:H116 mostx1Liquid, yellow
    Orough:HNM16 mostx1Semisolid, brown
    O121:H1910 yrstx1/stx2Liquid, brown
    O157:H748 yrstx1/stx2Liquid, brown
    O157:H73 yrstx1/stx2Liquid, brown
    O103:H2516 yrstx1Semisolid, brown
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Shiga-Toxigenic Escherichia coli Detection in Stool Samples Screened for Viral Gastroenteritis in Alberta, Canada
Marc Roger Couturier, Bonita Lee, Nathan Zelyas, Linda Chui
Journal of Clinical Microbiology Feb 2011, 49 (2) 574-578; DOI: 10.1128/JCM.01693-10

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Shiga-Toxigenic Escherichia coli Detection in Stool Samples Screened for Viral Gastroenteritis in Alberta, Canada
Marc Roger Couturier, Bonita Lee, Nathan Zelyas, Linda Chui
Journal of Clinical Microbiology Feb 2011, 49 (2) 574-578; DOI: 10.1128/JCM.01693-10
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