Table 1. Primers used for nested RT-PCR.

	primer	Tm	Product size
HE164F1	5′-GCR GTG GTT TCT GGG GTG AC-3′	58°C	164 bp
HE164R1	5′-CTG GGM YTG GTC DCG CCA AG-3′
HE137F2	5′-GYT GAT TCT CAG CCC TTC GC-3′		137 bp
HE137R2	5′-GMY TGG TCD CGC CAA GHG GA-3′