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Gewählte Publikation:

Publikationstyp: Zeitschriftenaufsatz
Dokumentart: Originalarbeit

Publikationsjahr: 2011

AutorInnen: Schoder, D; Melzner, D; Schmalwieser, A; Zangana, A; Winter, P; Wagner, M

Titel: Important vectors for Listeria monocytogenes transmission at farm dairies manufacturing fresh sheep and goat cheese from raw milk.

Quelle: J Food Prot. 2011; 74(6):919-924



Autor/innen der Vetmeduni Vienna:

Schmalwieser Alois
Schoder Dagmar
Wagner Martin
Winter Petra
Zangana Abdoulla

Beteiligte Vetmed-Organisationseinheiten
Abteilung für Lebensmittelmikrobiologie
Abteilung für Physiologie und Biophysik


Abstract:
The aim of this study was to determine the transmission routs of Listeria spp. in dairy farms manufacturing fresh cheese made from ovine and caprine raw milk and to evaluate the impact of Listeria monocytogenes mastitis on raw milk contamination. Overall, 5,799 samples, including 835 environmental samples, 230 milk and milk product samples, and 4,734 aseptic half-udder foremilk samples were collected from 53 dairy farms in the dairy intensive area of Lower Austria. Farms were selected for the study because raw milk was processed to cheese that was sold directly to consumers. A total of 153 samples were positive for Listeria spp., yielding an overall prevalence of 2.6%; L. monocytogenes was found in 0.9% of the samples. Bulk tank milk, cheese, and half-udder samples were negative for Listeria spp. Because none of the sheep and goats tested positive from udder samples, L. monocytogenes mastitis was excluded as a significant source of raw milk contamination. L. monocytogenes was detected at 30.2% of all inspected farms. Swab samples from working boots and fecal samples had a significantly higher overall prevalence (P < 0.001) of L. monocytogenes (15.7 and 13.0%, respectively) than did swab samples from the milk processing environment (7.9%). A significant correlation was found between the prevalence of L. monocytogenes in the animal and in the milk processing environment and the silage feeding practices. Isolation of L. monocytogenes was three to seven times more likely from farms where silage was fed to animals throughout the year than from farms where silage was not fed to the animals.

Keywords Pubmed: Animal Feed/microbiology
Animals
Cheese/microbiology
Consumer Product Safety
Dairying/methods
Dairying/standards*
Environmental Microbiology*
Equipment Contamination
Feces/microbiology
Female
Floors and Floorcoverings
Food Contamination/analysis*
Food Contamination/prevention & control
Food-Processing Industry/methods
Food-Processing Industry/standards
Goats
Hygiene*
Listeria monocytogenes/isolation & purification*
Mastitis/epidemiology
Mastitis/microbiology
Mastitis/veterinary
Milk/microbiology*
Sheep
Silage/microbiology


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