Maximum-likelihood tree based on nucleotide sequences of the complete open reading frame of genomes of West Nile virus (WNV) NSW2011 (boldface) and representative strains of WNV from the different lineages and clades. All published complete Kunjin (KUN) virus sequences are included. Bootstrap values are shown on the nodes and are expressed as a percentage of 1,000 replicates. Sequences downloaded from GenBank were WNVRussia88–90, AY277251; WNVRabensburg, AY765264; WNVSarafend, AY688948; WNVUgand