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Development of a m-PCR assay for simultaneous identification of Campylobacter jejuni and C. coli
1Unité d'Hygiène et Qualité des Produits Avicoles et Porcins, Agence Française de Sécurité Sanitaire des Aliments, Ploufragan, France.
Abstract:
Multiplex PCR assay (m-PCR) with three sets of primers was developed for simultaneous identification of Campylobacter jejuni and C. coli. Poultry faecal samples were enriched in Preston broth for 24 h and streaking on selective media was performed before and after enrichment. m-PCR was applied on bacterial cultures harvested from media plates. The data showed a selective effect of Preston broth which favoured the growth of C. coli. Identification of the species by the hippurate hydrolysis test and by the m-PCR was performed on 294 isolates of Campylobacter. The efficiency of the identification by the biochemical test is only 34% in comparison to 100% efficiency with the PCR. The use of our m-PCR in combination with the culture method allowed reliable detection and identification of C. jejuni and C. coli within 3-4 d.
Insights
A new multiplex PCR assay (m-PCR) accurately identifies Campylobacter jejuni and C. coli in poultry. This PCR method offers 100% efficiency, surpassing traditional biochemical tests for reliable bacterial detection.
Area of Science:
- Food Microbiology
- Molecular Biology
- Veterinary Science
Background:
- Campylobacter jejuni and C. coli are leading causes of bacterial gastroenteritis globally.
- Accurate identification of these species is crucial for food safety and public health surveillance.
- Traditional methods for Campylobacter species identification can be time-consuming and lack specificity.
Purpose of the Study:
- To develop and validate a multiplex PCR (m-PCR) assay for the simultaneous detection of C. jejuni and C. coli.
- To compare the efficiency of the developed m-PCR assay with conventional biochemical tests.
Main Methods:
- Development of a multiplex PCR assay using three primer sets for simultaneous identification.
- Enrichment of poultry fecal samples in Preston broth followed by streaking on selective media.
- Application of m-PCR on bacterial cultures and comparison with hippurate hydrolysis test results for 294 Campylobacter isolates.
Main Results:
- The Preston broth enrichment showed a selective effect, favoring C. coli growth.
- The m-PCR assay achieved 100% efficiency in identifying C. jejuni and C. coli.
- Conventional biochemical tests demonstrated only 34% efficiency in species identification.
Conclusions:
- The developed m-PCR assay provides a highly efficient and reliable method for simultaneous identification of C. jejuni and C. coli.
- Combining m-PCR with culture methods allows for rapid (3-4 days) and accurate detection of these important foodborne pathogens.