combination NS1 (White et 4, 1990) and EF3 (Smit et at, 1999) was used to amplify DNA which was cloned (TOPO TA; Invitrogen) and sequenced using an Applied Biosystems Genetic Analyser 3730 (Waltham, MA, USA). Between four and eight clones were sequenced for each sample and identified using NCBI BLAST (Altschul et al, 19