Serum and Liver Viral Titers.

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 the titers were 1��103 and 7.7��103, respectively.

a. 本检测方法的检测限为255拷贝/毫升。b. 尽管动物985在死亡时的血清滴度低于检测限，但该动物确实已被感染：其感染后第21天和第33天的病毒滴度分别为1×10³和7.7×10³。