isolation of listeria monocytogenes from raw milk and its environment at dairy farms in japan.the incidence of listeria monocytogenes contamination in raw milk from farm bulk tanks and silage was investigated monthly at 20 dairy farms in aomori prefecture, japan, from january to july in 1989. listeria sp. was isolated from one sample (5%) of raw milk collected in may, but l. monocytogenes was not isolated from raw milk. l. monocytogenes was isolated from two samples of silage (10%) collected in june. silage, cow feces, sawdust bedding, dust and soil in these farms were tested for listeri ...19902125110
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