| 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, ... | 1995 | 7578445 |
| 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 ... | 1995 | 7578446 |