Fig. 2: Maximum Likelihood phylogenetic tree inferred for 374 H1 hemagglutinin gene sequences of pre-2009 human influenza A viruses, and swine influenza A viruses collected globally from 1977 to 2020, including the H1v described in this study, A/Parana/3625/2020(H1N2)v (Case 1).
From: Zoonotic transmission of novel Influenza A variant viruses detected in Brazil during 2020 to 2023
Swine sequences isolated in Brazil contains the state of isolation within its names (Brazil_MG = Minas Gerais, Brazil_MS = Mato Grosso do Sul, Brazil_PR = Paraná, Brazil_RS = Rio Grande do Sul, Brazil_SC = Santa Catarina, Brazil_SP = São Paulo). Branches are colored by host as shown in the figure key. The tree is midpoint rooted for clarity, and all branch lengths are drawn to scale representing nucleotide substitutions per site. Black-circles at the internal nodes identify clades supported by SH-aLRT > 80% and/or UFB > 95%. A Phylogenetic tree showing the three genetic clades of H1 viruses of the 1B lineage that circulate in swine in Brazil (1B.2.3, 1B.2.4, and 1B.2.6). The swine-to-human introduction is highlighted by a gray-shaded form. B Topology details for Clade H1 1B.2.3 that comprises the HA of A/Parana/3625/2020(H1N2)v.
