A DNA microarray for the versatile diagnosis of infectious diarrhea

Area of Science:

• Microbiology
• Molecular Diagnostics
• Bioinformatics

Background:

• Diarrhea is often caused by coinfecting enteropathogens, necessitating sensitive diagnostic tools.
• Current diagnostic methods may not efficiently detect multiple pathogens simultaneously.

Purpose of the Study:

• To design and validate a DNA microarray for the simultaneous detection of common enteropathogens.
• To assess the sensitivity and specificity of the developed microarray for clinical stool samples.

Main Methods:

• A DNA microarray was designed with 60-bp probes for 33 bacteria and 7 viruses.
• Methanobrevibacter smithii was used as an internal positive control.
• The microarray was tested on negative controls, a spiked positive control, and 40 pathological stool specimens.

Main Results:

• The microarray achieved 100% specificity and 97.5% sensitivity.
• Methanobrevibacter smithii was detected in 95.9% of specimens.
• The assay successfully detected multiple enteropathogens, including Salmonella enterica, Campylobacter jejuni, pathogenic Escherichia coli, and adenovirus, in spiked and clinical samples.

Conclusions:

• The developed DNA microarray enables multiplexed detection of enteropathogens in stool samples.
• This diagnostic approach offers a promising tool for identifying coinfecting agents responsible for diarrheal diseases.