Technical Note: Isolation of Yersinia enterocolitica from raw milk

摘要

During a period of 5 years, 460 samples of raw milk were examined on the presence of Yersinia enterocolitica in different seasons, both in raw milk collection depots and dairies. The procedures of EPT pre-enrichment and PSTA enrichment and CIN agar were used for the isolation of Y. enterocolitica. It was found that 10% of the raw milk samples assayed contained Y. enterocolitica of serotype 09. The highest contamination of raw milk was identified in the winter period (26,37%) the lowest was in autumn(1,89%). A higher contamination with Y. enterocolitica species was recorded in the dairies (17,02%) than in the raw milk collection depots (5,15%).