Gaya P, Saralegui C, Medina M, Nunez M
Departamento de Tecnología de Alimentos, Centro de Investigación y Tecnología, Instituto Nacional de Investigaciones Agrarias, Madrid, Spain.
J Dairy Sci. 1996 Nov;79(11):1936-41. doi: 10.3168/jds.S0022-0302(96)76563-3.
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%).
在一年的时间里，每季度对西班牙中部405个农场的储奶罐中的山羊奶样本进行一次李斯特菌属分析。在1445份样本中，分别有2.56%和1.73%检测到单核细胞增生李斯特菌和无害李斯特菌。伊氏李斯特菌（0.21%的样本）和西格李斯特菌（0.07%的样本）很少分离到。只有6份牛奶样本被不止一种李斯特菌污染。在整个采样期间，大多数农场（92.59%）生产的牛奶显然不含单核细胞增生李斯特菌，88.40%的农场生产的牛奶显然不含李斯特菌属。李斯特菌属对牛奶的污染具有季节性；秋季（9.33%）和冬季（5.14%）样本中的污染发生率高于春季（0.85%）和夏季（0.85%）样本。山区农场样本中李斯特菌属的发生率（1.25%）低于高原农场样本（7.03%）。
