Rapid and specific detection of Escherichia coli clonal group A by gene-specific PCR

James R. Johnson, Krista Owens, Amee R. Manges, Lee W. Riley

Research output: Contribution to journalArticlepeer-review

55 Scopus citations


PCR primers specific for the recently described antimicrobial resistance-associated Escherichia coli clonal group A (CGA), a widespread cause of drug-resistant urinary tract infections in the United States, were devised on the basis of a novel single-nucleotide polymorphism identified within the housekeeping gene fumC, i.e., C288T. In comparison with two reference PCR-based fingerprinting methods, ERIC2 PCR and random amplified polymorphic DNA (RAPD) analysis, a PCR assay incorporating the new primers provided 100% sensitivity and 100% specificity for the detection of CGA among 138 diverse clinical and reference E. coli isolates. E. coli reference (ECOR) strain 47 was shown to be a member or a close relative of CGA (by ERIC2 PCR and RAPD analysis, respectively) and yielded a positive assay result. The new CGA-specific PCR assay, which exhibited interlaboratory reproducibility and stability under various experimental conditions, should allow the rapid and specific detection of CGA by any laboratory equipped for diagnostic PCR.

Original languageEnglish (US)
Pages (from-to)2618-2622
Number of pages5
JournalJournal of clinical microbiology
Issue number6
StatePublished - Jun 2004


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