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Enteroaggregative Escherichia coli quantification in children stool samples using quantitative PCR.

Ila Fernanda Nunes Lima¹, Josiane da Silva Quetz, Richard Littleton Guerrant

¹Institute of Biomedicine for Brazilian Semi-Arid (IBISAB) & Clinical Research Unit, Federal University of Ceara, Fortaleza, Ceara, Brazil.

APMIS : Acta Pathologica, Microbiologica, Et Immunologica Scandinavica

|December 11, 2012

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A new real-time PCR method accurately quantifies enteroaggregative Escherichia coli (EAEC) in stool. This sensitive and specific assay aids in understanding EAEC infections, particularly in children.

Area of Science:

Microbiology
Molecular Biology
Infectious Diseases

Background:

Enteroaggregative Escherichia coli (EAEC) is a significant pathogen causing infectious diarrhea, especially in vulnerable populations like children in resource-limited settings.
Accurate quantification of EAEC in clinical samples is crucial for understanding its role in disease pathogenesis and for epidemiological studies.

Purpose of the Study:

To develop and validate a SYBR Green-based real-time polymerase chain reaction (qPCR) method for the quantitative detection of EAEC directly from human stool DNA.
To assess the specificity, sensitivity, repeatability, and DNA extraction efficiency of the developed qPCR assay.

Main Methods:

A SYBR Green-based qPCR assay was designed for EAEC detection.
Specificity was tested against various strains of EAEC, other E. coli types, and Shigella.

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Sensitivity was determined by assessing the detection limit (CFU/reaction), and repeatability was evaluated. DNA extraction efficiency was assessed using spiked stool samples.

Main Results:

The qPCR assay demonstrated high specificity against tested bacterial strains.
The detection limit was found to be 67 CFU/reaction.
EAEC was quantified in naturally infected stool samples, ranging from 6.7 × 10^5 to 2 × 10^9 CFU/g of feces, with no significant loss of DNA during extraction.

Conclusions:

The developed SYBR Green-based qPCR method is a simple, rapid, reproducible, sensitive, and specific tool for quantifying EAEC in human stool samples.
This assay facilitates accurate EAEC quantification, which is essential for future research into EAEC pathophysiology and the impact of EAEC infections.