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Evaluation of a multiplex PCR method to detect enteroaggregative Escherichia coli
Área de Química Biológica, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo. Mendoza, Argentina.
Address correspondence to: Dra. María Elena Rüttler. Área de Química Biológica, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo. Casilla de Correo 33, (5500) Mendoza, ARGENTINA. E-mail: mruttler@fcm.uncu.edu.ar
BIOCELL 2006, 30(2), 301-308. https://doi.org/10.32604/biocell.2006.30.301
Abstract
Enteroaggregative Escherichia coli (EAEC) has been implicated in sporadic diarrhea in children and adults and has been identified as the cause of several outbreaks worldwide. The HEp-2 test remains the gold standard for identification of this pathotype. A 60-65 MDa plasmid encodes the aggregative adherence fimbriae (AAF/I and AAF/II), a transcriptional activator (aggR gene), the enteroaggregative heat-stable enterotoxin EAST1 (astA gene) and a cytotoxin (Pet). The standard assay for EAEC is performed only in research laboratories, because it is expensive, labor intensive and time-consuming. The Polymerase Chain Reaction (PCR) offers the possibility of rapid diagnosis. In the current study, a multiplex PCR assay which checks aggR and astA genes was designed. Eigthy- eight E.coli strains, isolated from children with acute diarrhea in Mendoza, Argentina, were characterized by the reference method (HEp-2 assay), and by aggRastA PCR. A strong correlation between the presence of the specific marker aggR and the reference test was found. The astA gene had a similar distribution between aggregative and localized strains, indicating that this gene could not be considered as a marker of EAEC. We conclude that aggR may be used to identify EAEC, using the PCR method as a screening test.Keywords
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