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Detection of Live Escherichia coli O157:H7 Cells by PMA-qPCR
Published on: February 1, 2014
Influence of Detection Methods in Characterizing Escherichia coli O157:H7 in Raw Goat Meat Using Conventional and
Zajeba Tabashsum1, Mafruha Nazneen, C R Ahsan
1Department of Microbiology, University of Dhaka.
Escherichia coli O157:H7 contamination in goat meat is a concern. Conventional and molecular methods revealed low detection rates of Shiga toxin-producing E. coli O157:H7, impacting food safety assessments.
Area of Science:
- Food Microbiology
- Molecular Biology
- Public Health
Background:
- Escherichia coli O157:H7 is a significant foodborne pathogen.
- Contamination of meat products poses a public health risk.
- Accurate detection methods are crucial for food safety.
Purpose of the Study:
- To analyze the prevalence of Escherichia coli O157:H7 in fresh goat meat from Dhaka city.
- To compare conventional and molecular detection methods for E. coli O157:H7.
- To identify virulence factors in detected isolates.
Main Methods:
- Selective agar plating for presumptive E. coli O157:H7 isolation.
- Biochemical assays (API 20E) and serological tests for confirmation.
- Polymerase Chain Reaction (PCR) for detecting virulence genes (eaeA, rfbE, fliC, stx1, stx2).
Main Results:
- Only 11 out of 86 presumptive isolates were confirmed as E. coli O157:H7 by biochemical and serological tests.
- PCR confirmed eaeA and rfbE genes in 10 isolates, fliC in six.
- Only 7% of presumptive isolates were confirmed as Shiga toxin-producing E. coli O157:H7.
Conclusions:
- Conventional and molecular methods show variability in detecting E. coli O157:H7 in goat meat.
- Low prevalence of Shiga toxin-producing E. coli O157:H7 was observed.
- Detection challenges highlight the need for optimized diagnostic strategies in food safety.
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