Novel Reassortant Influenza A(H1N2) Virus Derived from A(H1N1)pdm09 Virus Isolated from Swine, Japan, 2012
Figure. . Phylogenetic tree based on the nucleotide sequences of hemagglutinin (A) and neuraminidase (B) genes of A/swine/Gunma/1/2012, a novel H1N2 swine influenza virus (SIV) strain. Distance was calculated according to the Kimura 2-parameter method; the trees were constructed by using the neighbor-joining method with labeling of the branches showing at least 70% bootstrap support. Boldface text indicates the novel strain reassorted from strains of the SIV H1N2 subtype. Asterisks indicate reference strains compared with A/Swine/Gunma/1/2012 used to calculate the identity of neuraminidase gene. Scale bars indicate nucleotide substitutions per site.