CONTAMINATION OF RAW-MILK BY LISTERIA-MONOCYTOGENES ON DAIRY FARMS

被引:36
作者
HUSU, JR [1 ]
SEPPANEN, JT [1 ]
SIVELA, SK [1 ]
RAURAMAA, AL [1 ]
机构
[1] VALIO FINNISH COOPERAT DAIRIES ASSOC, DEPT RES & DEV, HELSINKI, FINLAND
来源
JOURNAL OF VETERINARY MEDICINE SERIES B-ZENTRALBLATT FUR VETERINARMEDIZIN REIHE B-INFECTIOUS DISEASES AND VETERINARY PUBLIC HEALTH | 1990年 / 37卷 / 04期
关键词
D O I
10.1111/j.1439-0450.1990.tb01058.x
中图分类号
S85 [动物医学(兽医学)];
学科分类号
0906 ;
摘要
Possible sources of exogenous contamination of raw milk by Listeria monocytogenes were examined on four dairy farms of different size and type of animal housing during morning milking. Feeds, including hay and concentrates, were found to be major sources of both pathogenic and nonpathogenic species of Listeria on the barns. L. innocua was the only species isolated from the grass silage, which was of good quality on all the farms. The numbers of Listeria were below 102/g in all feed samples. Fecal shedding of listeriae was detected in 11.9% of the cows and the prevalences of L. monocytogenes among farms ranged from no detections to 8.7 %. The number of Listeria isolations from constructions inside the barns and from the milking environment varied between the farms. Listeriae were detected almost everywhere on one of the farms whereas on another farm the only isolations were from feed passages and floors. 13.6 % of the swab samples taken from the teats before washing and drying were Listeria positive, whereas no isolations were made after cleaning the udder. Good milking and barn hygiene is considered important for diminishing the risks of exogenous contamination of raw milk by listeriae. © 1990 Blackwell Verlag GmbH
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页码:268 / 275
页数:8
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