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  • Title: Detection of Escherichia coli O157: H7 vt and rfb(O157) by multiplex polymerase chain reaction.
    Author: Visetsripong A, Pattaragulwanit K, Thaniyavarn J, Matsuura R, Kuroda A, Sutheinkul O.
    Journal: Southeast Asian J Trop Med Public Health; 2007 Jan; 38(1):82-90. PubMed ID: 17539251.
    Abstract:
    A rapid method for detection of Escherichia coli O157: H7 using multiplex PCR was developed. Two oligonucleotide primer pairs were used for simultaneously detection of vt encoding verotoxin genes for virulence factor and rfb(O157) encoding the O-antigen specific for E. coli O157: H7. Multiplex PCR generated two products of 215 bp and 420 bp for vt and rfb(O157), respectively. Multiplex PCR detected reference strain O157: H7 (NF-7777) with a sensitivity of 10(5) CFU per ml with no amplification of other 15 pathogenic bacteria. After incubation of 10(2) CFU/25 gram raw meat in tryptic soy broth at 37 degrees C for 8 hours, multiplex PCR conducted with the addition of 100 mg bovine serum albumin produced the two specific PCR products for E. coli O157: H7. This modified multiplex PCR is a rapid, sensitive, and specific technique for detecting and differentiating E. coli O157: H7 and has the potential to be used as an alternative to conventional methods for the screening of O157: H7 strains isolated from raw meat.
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