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Appl Environ Microbiol. 1993 July; 59(7): 2161-2165

Direct polymerase chain reaction detection of Campylobacter jejuni and Campylobacter coli in raw milk and dairy products.

Laboratory of Food Chemistry, University of Bern, Switzerland.

ABSTRACT

A polymerase chain reaction (PCR) method designed to sensitively detect and identify Campylobacter jejuni and Campylobacter coli without the need for isolating and culturing strains is described. The intergenic sequence between the flagellin genes flaA and flaB was amplified and characterized with a triple primer or seminested primer approach. A total of 50 bacterial strains, 27 of C. jejuni and C. coli and 23 of other species, were tested, giving no false-positive or false-negative results. The detection limit as determined by ethidium bromide staining of amplification products on agarose gels was 10 bacteria or less in artificially contaminated water, milk, and soft cheese samples with the seminested primer PCR assay. As an application of the PCR system, a set of 93 samples of milk and other dairy products was screened for the presence of C. jejuni and C. coli. We identified six positive samples (6.5%), while none were found with a conventional culture method.

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