TABLE 2.

Comparison of quantification using heterologous competitor RNA in by WNV RT-PCR and real-time RT-PCR assays with equine samples

Sample	Estimated concna by:
	RT-PCR	Real-time RT-PCR
Brain	2000-20,000	8,652
Brain	20-200	50
Brain	≥20,000	29,801
Whole blood	2-20	9
Whole blood	20-200	68
Whole blood	20-200	10

^aNumber of viral RNA copies per 2 μl of purified RNA.