Open Access Research article

Risk factors associated with within-herd transmission of bovine leukemia virus on dairy farms in Japan

Sota Kobayashi1, Toshiyuki Tsutsui1, Takehisa Yamamoto1, Yoko Hayama1, Ken-ichiro Kameyama2, Misako Konishi2 and Kenji Murakami2*

Author Affiliations

1 Epidemiological Research Team, National Institute of Animal Health, 3-1-5, Kannondai, Tsukuba-shi, Ibaraki, Japan

2 Research Team for Viral Diseases, National Institute of Animal Health, 3-1-5, Kannondai, Tsukuba-shi, Ibaraki, Japan

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BMC Veterinary Research 2010, 6:1  doi:10.1186/1746-6148-6-1

Published: 7 January 2010

Additional files

Additional file 1:

Questionnaire used for the sero-epidemiological survey of the enzootic bovine leukosis in Japan, 2007. The questions inquired about cattle housing conditions, cow replacement, provision of own grazing area or free range on the farm, the presence of horseflies in summer, dehorning, the use of plastic sleeves for rectal palpation, change of needles used for herd vaccination, colostrum feeding, and general data on herd demography.

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