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Journal of Dairy Science Vol. 79 No. 11 1936-1941
© 1996 by American Dairy Science Association ®
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Occurrence of Listeria monocytogenes and Other Listeria spp. in Raw Caprine Milk

P. Gaya 1, C. Saralegui 1, M. Medina 1, and M. Nuñez 1

1 Departamento de Tecnología de Alimentos, Centro de Investigación y Tecnologia, Instituto Nacional de Investigaciones Agrarias, Carretera de La Coruña Km 7, Madrid, 28040 Spain

Samples of caprine milk from bulk tanks of 405 farms in central Spain were analyzed for Listeria spp. once per season over a 1-yr period. Listeria monocytogenes and Listeria innocua were detected in 2.56 and 1.73% of the 1445 samples, respectively. Listeria ivanovii (0.21% samples) and Listeria seeligeri (0.07% samples) were rarely isolated. Only 6 milk samples were contaminated by more than one Listeria species. Most farms (92.59%) produced milk that was apparently free from L. monocytogenes throughout the sampling period, and 88.40% produced milk that was apparently free from Listeria spp. Milk contamination by Listeria spp. was seasonal; incidence in autumn (9.33%) and winter (5.14%) samples was higher than incidence in spring (0.85%) and summer (0.85%) samples. Occurrence of Listeria spp. was lower in samples from mountain farms (1.25%) than in samples from plateau farms (7.03%).

Key Words: Listeria monocytogenes • Listeria spp. • caprine milk

Submitted on December 27, 1995
Accepted on May 13, 1996




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A. J. Ho, V. R. Lappi, and M. Wiedmann
Longitudinal Monitoring of Listeria monocytogenes Contamination Patterns in a Farmstead Dairy Processing Facility
J Dairy Sci, May 1, 2007; 90(5): 2517 - 2524.
[Abstract] [Full Text] [PDF]


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Copyright © 1996 by the American Dairy Science Association ®.