Abstract
A description is given of a pre-treatment for milk samples which allows it to be filtered through 0.2 μm pore-size membrane filters without reducing the initial number of bacteria. The efficiency of the method was demonstrated in milk samples inoculated with Escherichia coli O25:H-42, a food-borne pathogen, by comparison with a control in tryptone soya broth (TSB). No significant differences were found between direct microscopic counts in milk samples and controls in TSB.
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