However, genetically, when these viruses in North America and Asia and Europe have been looked at, it appears that there's actually very little exchange of genes—some, but very little suggesting that there's probably not much exchange, but there probably is some.
Cependant, au plan génétique, lorsqu'on étudie les virus d'Amérique du Nord, d'Asie et d'Europe, il semble n'y avoir en réalité que très peu d'échanges de gènes — un peu, mais pas beaucoup — .