Ueno H, Yokota K, Arai T, Muramatsu Y, Taniyama H, Iida T, Morita C
Department of Veterinary Public Health, Rakuno Gakuen University, Hokkaido, Japan.
Microbiol Immunol. 1996;40(2):121-24. doi: 10.1111/j.1348-0421.1996.tb03326.x.
The prevalence of Listeria monocytogenes in the environment of dairy farms was surveyed from December 1993 to June 1994 in one city of Hokkaido. L. monocytogenes was isolated from 3 out of 5 farms investigated. Serovar 4b organism was isolated from the brain stem of a cow from one farm which was clinically diagnosed as having listeriosis. The same serovar of L. monocytogenes was also isolated from the rectal contents of a healthy cow, straw on the floor, straw in the barn, and silage scattered around the silo from the same farm. At another farm, with no reported cases of bovine listeriosis, serovar 1/2 organism was isolated from the same types of samples as the above mentioned farm except from straw on the floor. The difference in the isolation rates of the organism from straw on the floor between the two farms (22%:5/23 vs 0%:0/24) is considered to be caused by the different feeding methods of silage between the two farms.
1993年12月至1994年6月期间，在北海道的一个城市对奶牛场环境中单核细胞增生李斯特菌的流行情况进行了调查。在调查的5个农场中，有3个农场分离出了单核细胞增生李斯特菌。从一个农场的一头临床诊断为患李斯特菌病的奶牛的脑干中分离出了血清型4b菌株。从同一农场的一头健康奶牛的直肠内容物、地面上的稻草、牛舍中的稻草以及筒仓周围散落的青贮饲料中也分离出了相同血清型的单核细胞增生李斯特菌。在另一个没有报告牛李斯特菌病病例的农场，从与上述农场相同类型的样本中分离出了血清型1/2菌株，但地面上的稻草除外。两个农场地面稻草中该菌分离率的差异（22%:5/23对0%:0/24）被认为是由两个农场青贮饲料喂养方式不同所致。
