Microbiological composition of raw milk from selected farms in the Camembert region of Normandy |
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Authors: | N. Desmasures,F. Bazin,& M. Gué guen |
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Affiliation: | Laboratoire de Microbiologie Alimentaire, Institut de Recherche en Biologie Appliquée, Universitéde Caen, Caen, France |
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Abstract: | Raw milk from 27 farms was sampled over 6 months for listerias, salmonellas, Yersinia enterocolitica and campylobacters. Total bacterial counts and somatic cell counts were measured. Lactococci, lactobacilli, dextran-producing leuconostocs, Brevibacterium linens , yeasts and moulds, Staphylococcus aureus and other Micrococcaceae, Pseudomonas , coliforms, Escherichia coli , enterococci, Clostridium perfringens and spores of anaerobic lactate-fermenting bacteria were also counted. Pseudomonas (2000 cfu ml−1), lactococci (760 cfu ml−1) and Micrococcaceae (720 cfu ml−1) were the most numerous groups. Lactic acid bacteria were detected in all samples. Coliforms were present in most samples, but 84% of samples had counts <100 cfu ml−1. Staphylococcus aureus was detected in 62% of milks, the average count was 410 cfu ml−1. About 80% of supplies had ≤10 E. coli cfu ml−1 and all samples had 1 Cl. perfringens cfu ml−1. Two of the tested milks were positive for salmonellas (2·9%), four were positive for Listeria monocytogenes (5·8%), 25 for Yersinia enterocolitica (36%) and one for campylobacters (1·4%). |
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