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死亡时的血清滴度低于检测限，但该动物确实已被感染：感染后第21天和第33天的血清滴度分别为1×10³和7.7×10³。