Figure 3
From: Evolutionary genomics of the pandemic 2009 H1N1 influenza viruses (pH1N 1v)
Reassortment events involved with the genetic parents of the 2009 H1N1 influenza viruses. Asia, particularly Thailand, was identified as the place where reassortments between Eurasian and classical swine sublineages occurred; alternatively, Asia and North America, especially as South Korea and USA, was where reassortments between classical and avian-to-swine reassortant sublineages happened.