prevalence of and risk factors for listeria species on dairy farms.this cross-sectional study determined the prevalence of listeria spp. in bulk-tank milk on dairy farms in the region of galicia in northwest spain. the aim was to identify management practices associated with the presence of listeria spp. and possible effects on milk hygienic quality. a total of 98 farms was randomly selected on the basis of an expected prevalence of 6.5% for listeria monocytogenes from 20,107 dairy farms in the region. bulk-tank milk samples were obtained from 98 farms, fecal s ...200717954748
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