prevalence of cattle persistently infected with bovine viral diarrhea virus in 20 dairy herds in two counties in central michigan and comparison of prevalence of antibody-positive cattle among herds with different infection and vaccination status.all cattle in 20 dairy herds randomly selected from herds participating in the dairy herd improvement association program in 2 counties in central michigan were tested for the presence of bovine viral diarrhea virus (bvdv). virus-positive animals were retested to ascertain persistent infection with the virus. a total of 5,481 animals were tested for presence of bvdv. in 9 of the herds, all animals were also tested for virus neutralizing antibody titer. based on infection and vaccination status, ...19957578445
application of antibody titers against bovine viral diarrhea virus (bvdv) as a measure to detect herds with cattle persistently infected with bvdv.based on the distribution of antibody titers against bovine viral diarrhea virus (bvdv) in 10 michigan dairy herds, it was calculated that screening of 5 young stock for bvdv antibody titer could be used to distinguish herds with persistently infected (pi) animals from herds without such animals. the herds were selected to represent 3 different herd categories: a, herds without use of vaccination and without pi animals (5 herds); b, herds with use of killed vaccine but no pi animals (2 herds); c ...19957578446
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