IngentaConnect Detection of Viable Enterohemorrhagic Escherichia coli O157 Using...

Authors: Tsai, Tsung-Yu¹; Lee, Wan-Ju¹; Huang, Yu-Ju¹; Chen, Kuang-Lo²; Pan, Tzu-Ming¹

Source: Journal of Food Protection®, Volume 69, Number 10, October 2006 , pp. 2320-2328(9)

Publisher: International Association for Food Protection

Abstract:

Enterohemorrhagic Escherichia coli O157:H7 is an infectious pathogen and outbreaks have been reported all over the world, specifically in Australia, Canada, Japan, the United States, and in various countries in Europe and South Africa. Therefore, it is necessary to develop rapid methods to determine the target pathogens for food sanitation and disease. Three combinations of primers and probes were designed to detect and identify E. coli O157 using the TaqMan detection system which focuses on the specific genes eae, rfb_O157, and stxII. Reverse transcription (RT) multiplex TaqMan PCR was carried out to accurately detect viable target cells correctly. Furthermore, the acidic pretreatment and immunomagnetic separation (IMS) of food and stool samples also improved the specificity and accuracy of the RT multiplex TaqMan PCR. The developed multiplex TaqMan PCR was effective in differentiating E. coli O157, enterovirulent E. coli, and non-E. coli pathogens from 100 strains which were isolated from clinical patients and the environment. Viable and nonviable cells were also distinguished by this assay. The pretreatment protocol, which included IMS to concentrate and purify the E. coli O157, was developed and the sensitivity of the assay was improved to 10⁰ CFU/ml in pure culture, food, and stool samples. The TaqMan PCR assay is a rapid test for the detection of E. coli O157 in food and stool matrices. It shortens the process time and increases the specificity of the pathogens detected. This is critical for improving the safety and sanitation of our food supply.

Document Type: Research article

Affiliations: 1: Institute of Microbiology and Biochemistry, National Taiwan University, Taipei, Taiwan 106, Republic of China 2: Institute of Microbiology and Biochemistry, National Taiwan University, Taipei, Taiwan 106, Republic of China; Division of Laboratory Research and Development, Center for Disease Control, Department of Health, Taipei, Taiwan 115, Republic of Chin

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Detection of Viable Enterohemorrhagic Escherichia coli O157 Using the Combination of Immunomagnetic Separation with the Reverse Transcription Multiplex TaqMan PCR System in Food and Stool Samples