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ToolsGilmour, Matthew W., Chui, Linda, Chiu, Theodore, Tracz, Dobryan M., Hagedorn, Kathryn, Tschetter, Lorelee, Tabor, Helen, Lai, King Ng and Louie, Marie (2009) Isolation and detection of Shiga toxin-producing Escherichia coli in clinical stool samples using conventional and molecular methods. Journal of Medical Microbiology, 58 (7). pp. 905-911. ISSN 0022-2615
Full text not available from this repository. (Request a copy)Abstract
The isolation of Shiga toxin-producing Escherichia coli (STEC) other than serogroup O157 from clinical stool samples is problematic due to the lack of differential phenotypic characteristics from non-pathogenic E. coli. The development of molecular reagents capable of identifying both toxin and serogroup-specific genetic determinants holds promise for a more comprehensive characterization of stool samples and isolation of STEC strains. In this study, 876 stool samples from paediatric patients with gastroenteritis were screened for STEC using a cytotoxicity assay, commercial immunoassay and a conventional PCR targeting Shiga-toxin determinants. In addition, routine culture methods for isolating O157 STEC were also performed. The screening assays identified 45 stools presumptively containing STEC, and using non-differential culture techniques a total of 20 O157 and 22 non-O157 strains were isolated. These included STEC serotypes O157 : H7, O26 : H11, O121 : H19, O26 : NM, O103 : H2, O111 : NM, O115 : H18, O121 : NM, O145 : NM, O177 :NM and O5: NM. Notably, multiple STEC serotypes were isolated from two clinical stool samples (yielding O157 :H7 and O26 : H11, or O157 :H7 and O103 :H2 isolates). These data were compared to molecular serogroup profiles determined directly from the stool enrichment cultures using a LUX real-time PCR assay targeting the O157 fimbrial gene lpfA, a microsphere suspension array targeting allelic variants of espZ and a gnd-based molecular Oantigen serogrouping method. The genetic profile of individual stool cultures indicated that the espZ microsphere array and lpfA real-time PCR assay could accurately predict the presence and provide preliminary typing for the STEC strains present in clinical samples. The gnd-based molecular serogrouping method provided additional corroborative evidence of serogroup identities. This toolbox of molecular methods provided robust detection capabilities for STEC in clinical stool samples, including co-infection of multiple serogroups.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | microbiology,microbiology (medical) ,/dk/atira/pure/subjectarea/asjc/2400/2404 |
| Faculty \ School: | Faculty of Medicine and Health Sciences > Norwich Medical School |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 14 Sep 2022 10:31 |
| Last Modified: | 21 Oct 2022 01:42 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/88260 |
| DOI: | 10.1099/jmm.0.007732-0 |
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