aThe detection limit for this assay is 255 copies/ml.bAlthough the serum titer was below the limit of detection at the time of death, animal 985 was infected because at days 21 and 33 post infection t
aThe detection limit for this assay is 255 copies/ml. bAlthough the serum titer was below the limit of detection at the time of death, animal 985 was infected because at days 21 and 33 post infection