Table 2. Influence of spiking on the performance of viral nucleic acid purification.

	Virus	Unspiked specimen (A)	IC spiked specimen (B)	Wilcoxon test
a	CMV 10−3	33.6	33.8	NS
	CMV 10−4	36.3	36.6	NS
	CMV 10−5	39.6	39.4	NS
b	EV 10−3	30.1	30.6	NS
	EV 10−4	33.7	33.8	NS
	EV 10−5	38.2	37.8	NS

Cycles Thresholds (Ct) of serial dilutions of supernatant media of CMV (a) or EV (b) cell cultures unspiked (A) or spiked (B) with T4-MS2 IC were presented here. Each samples were tested in triplicate (the mean value was calculated). The Wilcoxon test were used to compared Ct values (NS = non significative).