Volume 29, Number 1—January 2023
Research
Human Immunity and Susceptibility to Influenza A(H3) Viruses of Avian, Equine, and Swine Origin
Figure 1

Figure 1. Epidemiologic and phylogenetic relationship between avian, equine, human, and swine influenza A test viruses. A) Schematic positioning of the test viruses in the influenza A(H3) virus epidemiology. B) Maximum-likelihood neighbor-joining phylogenetic tree of the hemagglutinin 1 of the test viruses. Complete isolate names are provided in [[ANCHOR###T2###Table 2###Anchor]]. Scale bar indicates amino acid substitutions per site.