TABLE 1.

HCV RNA titers (log₁₀ IU/ml) of the ISS preparation and WHO standard calculated by using the manufacturer's formula

Day	Titer (log10 IU/ml)
	ISS 0498 Sample					WHO standarda
	A	B	C	D	Mean
1	3.62	3.81	3.76	3.42	3.65	5.45
2	3.63	3.90	3.68	3.82	3.76	5.45
3	3.77	3.86	4.15	3.78	3.89	5.68
4	3.49	3.31	3.54	3.62	3.49	5.36
Overall mean					3.70	5.49

^aFigures corrected by the predilution factor (1:100).