Viruses of this clade belonged to the Eurasian gene pool and included a diverse group of NA subtype combinations (N1, N2, N5 and N8), but none of these isolates grouped with the previously described H6N2 viruses of the A/duck/Shantou/339/2000 (ST339-like) and H6N1 viruses of the W312-like influenza subtype. This evidence concerns the gene XK and influenza.