bovine viral diarrhea virus (bvdv) 1b: predominant bvdv subtype in calves with respiratory disease.the prevalence of bovine viral diarrhea virus (bvdv) infections was determined in 2 groups of stocker calves with acute respiratory disease. both studies used calves assembled after purchase from auction markets by an order buyer and transported to feedyards, where they were held for approximately 30 d. in 1 study, the calves were mixed with fresh ranch calves from a single ranch. during the studies, at day 0 and at weekly intervals, blood was collected for viral antibody testing and virus isola ...200212146890
respiratory tract disease and mucosal colonization by pasteurella haemolytica in transported follow incidence of pasteurella haemolytica (ph) in the upper respiratory tract of healthy calves at the farm and through the marketing process, and to determine the effect of vaccination on ph colonization of the upper respiratory tract and on the incidence of respiratory tract disease (rtd).19968874726
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