Infectious diarrhea broke out on 7 and 2 farms in Shimane Prefecture in October, 1976, and November, 1977, involving 59 of 85 cows (69.4%) and 43 of 76 cows (56.6%), respectively. No virus was isolated from diarrheal feces in bovine kidney or bovine testicle cell cultures. When a survey was conducted on 11 cows for antibodies against 6 known pathological viruses, nine cows (81.8%) showed a significant increase in titer of HI antibody against bovine coronavirus.
Diarrhea was transient, lasting for 2-3 days, but it took 2-3 weeks for recovery of milk yields.
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