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Abstract
Thirty samples of raw milk, originating from individual producers in the Turin area, were examined for the presence ofYersinia enterocolitica. A cold enrichment method with phosphate-buffered saline (PBS) 1/15M, pH 7.6, and sorbitol-bile-salts broth (SB) was used. After 7, 14, or 21 days at 4°–5°C, plating was performed on selective agar media directly (MacConkey agar andSalmonella-Shigella agar) after the alkali method was used. Six strains ofY. enterocolitica (biotype 1) and 32 strainsY. enterocolitica-like (threeY. fredericksenii; nineYersinia rhamnose-, melibiose+, α-methyl-d-glucoside+, raffinose+, probablyYersinia intermedia biotype rhamnose-; and 20Y. intermedia) were isolated.Yersinia strains were found in 11 samples of raw milk, andY. enterocolitica in four samples.
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