Isolation and genetic characterization of a coinfection of non-O157 Shiga toxin-producing Escherichia coli

Matthew W. Gilmour, Helen Tabor, Gehua Wang, Clifford G. Clark, Dobryan M. Tracz, Adam B. Olson, Mariola Mascarenhas, Mohamed A. Karmali, Tim Mailman, Lai King Ng

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15 Citations (Scopus)


A coinfection of O177:NM and O55:H7 Shiga toxin-producing Escherichia coli (STEC) was identified for a child with acute bloody diarrhea and hemolytic uremic syndrome by using culture and serotype-specific molecular reagents. The profile of O157-related genetic islands revealed that the O55:H7 isolate was highly similar to O157 STEC whereas the O177:NM isolate lacked several fimbrial O islands and non-locus-of-enterocyte-effacement effector determinants. However, both STEC serotypes are known to cause serious disease, and the significant repertoire of virulence determinants in both strains made it impossible to determine their individual contributions to the clinical symptoms.

Original languageEnglish
Pages (from-to)3771-3773
Number of pages3
JournalJournal of Clinical Microbiology
Issue number11
Publication statusPublished - Nov 2007

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