Abstract
We investigated bulk milk samples form 196 herds in 2 districts of Hokkaido (151 farms from district A and 45 farms from district B) to determine the prevalence of infection with the bovine viral-diarrhea virus (BVDV). The BVDV was detected from a few area-A samples but from none of the area-B samples. The virus-neutralization test conducted to detect BVDV antibodies in bulk-milk whey showed neutralizing-antibody titers (NT) of more than 16 in 166 samples (84.7%). Epidemiological information obtained from 132 of the 166 herds showed that 64 herds (48.5%) had BVDV NT of more than 16. None of these herds, however, had histories of BVDV infection or vaccination; and no animals had been introduced into them from other farms. These results suggest that BVDV prevailed in these areas irrespective of BVDV-gene detection, although the origin of the BVDV infection remained unclear. Therefore, eradicating BVDV from dairy populations may necessitate longterm assessment of herd BVDV infection.
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