Three types of status were defined for BCV and BRSV infections ,
based on 1 ) the dynamics over a 7-mo period of BCV - and BRSV - specific antibody levels in pooled milk of primiparous cows ;
Three types of status were defined for BCV and BRSV infections , based on 1 ) the dynamics over a 7-mo period of BCV - and BRSV - specific antibody levels in pooled milk of primiparous cows ; 2 ) the possible occurrence of presumably BCV - and BRSV - related clinical outbreaks ; and 3 ) the combination of both pieces of information .
Three types of status were defined for BCV and BRSV infections , based on 1 ) the dynamics over a 7-mo period of BCV - and BRSV - specific antibody levels in pooled milk of primiparous cows ; 2 ) the possible occurrence of presumably BCV - and BRSV - related clinical outbreaks ; and 3 ) the combination of both pieces of information .