''Peruvian viruses belong to lineage 2.3.4.4b, but they are 4:4 #reassortants where 4 genomic #segments (PA, HA, NA and MP) position within the #Eurasian lineage that initially entered North #America from Eurasia, while the other 4 genomic segments (PB2, PB1, NP and NS) position within the American lineage (clade C) that circulated in North America. ''