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

Sota Kobayashi, Toshiyuki Tsutsui, Takehisa Yamamoto, Yoko Hayama, Ken-ichiro Kameyama, Misako Konishi, and Kenji Murakami

Although several attempts have been made to control enzootic bovine leukosis (EBL) at the local level, a nationwide control program has not been implemented in Japan, except for passive surveillance. Effective control of EBL requires that the transmission routes of bovine leukemia virus (BLV) infection should be identified and intercepted based on scientific evidence.

In this cross-sectional study, we examined the risk factors associated with within-herd transmission of BLV on infected dairy farms in Japan. Blood samples taken from 30 randomly selected adult cows at each of 139 dairy farms were tested by enzyme-linked immunosorbent assay (ELISA). Information on herd management was collected using a structured questionnaire.

Infected farms were defined as those with more than one ELISA-positive animal and accounted for 110 (79.1%) of the 139 farms in the study. Completed questionnaires obtained from 90 of these 110 farms were used for statistical analysis.


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Article made possible through the contribution of Kenji Murakami.

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