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Indigenous rapid diagnostic method for Escherichia coli O157:H7
C Vaishnavi1, R Gupta, B R Thapa
1Department of Gastroenterology, Postgraduate Institute of Medical Education and Research, Chandigarh-160 012. medinst@pgi.chd.nic.in
Tropical Gastroenterology : Official Journal of the Digestive Diseases Foundation
|October 30, 2001
Summary
A new rapid assay for detecting Escherichia coli O157:H7 (E. coli O157:H7) in diarrheal stool samples provides results in 7-10 hours. This method offers a faster alternative to conventional techniques, aiding quicker diagnosis and patient management.
Area of Science:
- Microbiology
- Clinical Diagnostics
- Infectious Diseases
Background:
- Rapid detection of Escherichia coli O157:H7 (E. coli O157:H7) is crucial for managing diarrheal illnesses.
- Current diagnostic methods can be time-consuming, delaying differential diagnosis and treatment.
Purpose of the Study:
- To develop and evaluate a rapid assay for the detection of E. coli O157:H7 in diarrheal stool samples.
- To compare the speed and efficacy of the rapid assay against conventional culture methods.
Main Methods:
- A novel rapid assay involving indole production, beta-glucuronidase enzyme testing, and latex agglutination with E. coli O157 and E. coli H7 antisera.
- Inoculation of stool samples into peptone water and MacConkey broth, followed by specific biochemical and immunological tests.
- Confirmation of results using conventional culture on sorbitol MacConkey agar.
Main Results:
- The rapid assay identified E. coli O157:H7 in 3 out of 50 diarrheal stool samples.
- The assay demonstrated a turnaround time of 7-10 hours, significantly faster than the 3-day conventional method.
- Indole positivity, negative beta-glucuronidase activity, and positive latex agglutination were key indicators for E. coli O157:H7.
Conclusions:
- The developed rapid assay is effective for the initial screening of fecal specimens for E. coli O157:H7.
- This method can significantly reduce diagnostic time, facilitating prompt clinical decisions for patients with diarrhea.
- Routine implementation of this rapid assay can improve the management of E. coli O157:H7 infections.